+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.chai = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
+module.exports = require('./lib/chai');
+
+},{"./lib/chai":2}],2:[function(require,module,exports){
+/*!
+ * chai
+ * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+var used = [];
+
+/*!
+ * Chai version
+ */
+
+exports.version = '4.2.0';
+
+/*!
+ * Assertion Error
+ */
+
+exports.AssertionError = require('assertion-error');
+
+/*!
+ * Utils for plugins (not exported)
+ */
+
+var util = require('./chai/utils');
+
+/**
+ * # .use(function)
+ *
+ * Provides a way to extend the internals of Chai.
+ *
+ * @param {Function}
+ * @returns {this} for chaining
+ * @api public
+ */
+
+exports.use = function (fn) {
+ if (!~used.indexOf(fn)) {
+ fn(exports, util);
+ used.push(fn);
+ }
+
+ return exports;
+};
+
+/*!
+ * Utility Functions
+ */
+
+exports.util = util;
+
+/*!
+ * Configuration
+ */
+
+var config = require('./chai/config');
+exports.config = config;
+
+/*!
+ * Primary `Assertion` prototype
+ */
+
+var assertion = require('./chai/assertion');
+exports.use(assertion);
+
+/*!
+ * Core Assertions
+ */
+
+var core = require('./chai/core/assertions');
+exports.use(core);
+
+/*!
+ * Expect interface
+ */
+
+var expect = require('./chai/interface/expect');
+exports.use(expect);
+
+/*!
+ * Should interface
+ */
+
+var should = require('./chai/interface/should');
+exports.use(should);
+
+/*!
+ * Assert interface
+ */
+
+var assert = require('./chai/interface/assert');
+exports.use(assert);
+
+},{"./chai/assertion":3,"./chai/config":4,"./chai/core/assertions":5,"./chai/interface/assert":6,"./chai/interface/expect":7,"./chai/interface/should":8,"./chai/utils":22,"assertion-error":33}],3:[function(require,module,exports){
+/*!
+ * chai
+ * http://chaijs.com
+ * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+var config = require('./config');
+
+module.exports = function (_chai, util) {
+ /*!
+ * Module dependencies.
+ */
+
+ var AssertionError = _chai.AssertionError
+ , flag = util.flag;
+
+ /*!
+ * Module export.
+ */
+
+ _chai.Assertion = Assertion;
+
+ /*!
+ * Assertion Constructor
+ *
+ * Creates object for chaining.
+ *
+ * `Assertion` objects contain metadata in the form of flags. Three flags can
+ * be assigned during instantiation by passing arguments to this constructor:
+ *
+ * - `object`: This flag contains the target of the assertion. For example, in
+ * the assertion `expect(numKittens).to.equal(7);`, the `object` flag will
+ * contain `numKittens` so that the `equal` assertion can reference it when
+ * needed.
+ *
+ * - `message`: This flag contains an optional custom error message to be
+ * prepended to the error message that's generated by the assertion when it
+ * fails.
+ *
+ * - `ssfi`: This flag stands for "start stack function indicator". It
+ * contains a function reference that serves as the starting point for
+ * removing frames from the stack trace of the error that's created by the
+ * assertion when it fails. The goal is to provide a cleaner stack trace to
+ * end users by removing Chai's internal functions. Note that it only works
+ * in environments that support `Error.captureStackTrace`, and only when
+ * `Chai.config.includeStack` hasn't been set to `false`.
+ *
+ * - `lockSsfi`: This flag controls whether or not the given `ssfi` flag
+ * should retain its current value, even as assertions are chained off of
+ * this object. This is usually set to `true` when creating a new assertion
+ * from within another assertion. It's also temporarily set to `true` before
+ * an overwritten assertion gets called by the overwriting assertion.
+ *
+ * @param {Mixed} obj target of the assertion
+ * @param {String} msg (optional) custom error message
+ * @param {Function} ssfi (optional) starting point for removing stack frames
+ * @param {Boolean} lockSsfi (optional) whether or not the ssfi flag is locked
+ * @api private
+ */
+
+ function Assertion (obj, msg, ssfi, lockSsfi) {
+ flag(this, 'ssfi', ssfi || Assertion);
+ flag(this, 'lockSsfi', lockSsfi);
+ flag(this, 'object', obj);
+ flag(this, 'message', msg);
+
+ return util.proxify(this);
+ }
+
+ Object.defineProperty(Assertion, 'includeStack', {
+ get: function() {
+ console.warn('Assertion.includeStack is deprecated, use chai.config.includeStack instead.');
+ return config.includeStack;
+ },
+ set: function(value) {
+ console.warn('Assertion.includeStack is deprecated, use chai.config.includeStack instead.');
+ config.includeStack = value;
+ }
+ });
+
+ Object.defineProperty(Assertion, 'showDiff', {
+ get: function() {
+ console.warn('Assertion.showDiff is deprecated, use chai.config.showDiff instead.');
+ return config.showDiff;
+ },
+ set: function(value) {
+ console.warn('Assertion.showDiff is deprecated, use chai.config.showDiff instead.');
+ config.showDiff = value;
+ }
+ });
+
+ Assertion.addProperty = function (name, fn) {
+ util.addProperty(this.prototype, name, fn);
+ };
+
+ Assertion.addMethod = function (name, fn) {
+ util.addMethod(this.prototype, name, fn);
+ };
+
+ Assertion.addChainableMethod = function (name, fn, chainingBehavior) {
+ util.addChainableMethod(this.prototype, name, fn, chainingBehavior);
+ };
+
+ Assertion.overwriteProperty = function (name, fn) {
+ util.overwriteProperty(this.prototype, name, fn);
+ };
+
+ Assertion.overwriteMethod = function (name, fn) {
+ util.overwriteMethod(this.prototype, name, fn);
+ };
+
+ Assertion.overwriteChainableMethod = function (name, fn, chainingBehavior) {
+ util.overwriteChainableMethod(this.prototype, name, fn, chainingBehavior);
+ };
+
+ /**
+ * ### .assert(expression, message, negateMessage, expected, actual, showDiff)
+ *
+ * Executes an expression and check expectations. Throws AssertionError for reporting if test doesn't pass.
+ *
+ * @name assert
+ * @param {Philosophical} expression to be tested
+ * @param {String|Function} message or function that returns message to display if expression fails
+ * @param {String|Function} negatedMessage or function that returns negatedMessage to display if negated expression fails
+ * @param {Mixed} expected value (remember to check for negation)
+ * @param {Mixed} actual (optional) will default to `this.obj`
+ * @param {Boolean} showDiff (optional) when set to `true`, assert will display a diff in addition to the message if expression fails
+ * @api private
+ */
+
+ Assertion.prototype.assert = function (expr, msg, negateMsg, expected, _actual, showDiff) {
+ var ok = util.test(this, arguments);
+ if (false !== showDiff) showDiff = true;
+ if (undefined === expected && undefined === _actual) showDiff = false;
+ if (true !== config.showDiff) showDiff = false;
+
+ if (!ok) {
+ msg = util.getMessage(this, arguments);
+ var actual = util.getActual(this, arguments);
+ throw new AssertionError(msg, {
+ actual: actual
+ , expected: expected
+ , showDiff: showDiff
+ }, (config.includeStack) ? this.assert : flag(this, 'ssfi'));
+ }
+ };
+
+ /*!
+ * ### ._obj
+ *
+ * Quick reference to stored `actual` value for plugin developers.
+ *
+ * @api private
+ */
+
+ Object.defineProperty(Assertion.prototype, '_obj',
+ { get: function () {
+ return flag(this, 'object');
+ }
+ , set: function (val) {
+ flag(this, 'object', val);
+ }
+ });
+};
+
+},{"./config":4}],4:[function(require,module,exports){
+module.exports = {
+
+ /**
+ * ### config.includeStack
+ *
+ * User configurable property, influences whether stack trace
+ * is included in Assertion error message. Default of false
+ * suppresses stack trace in the error message.
+ *
+ * chai.config.includeStack = true; // enable stack on error
+ *
+ * @param {Boolean}
+ * @api public
+ */
+
+ includeStack: false,
+
+ /**
+ * ### config.showDiff
+ *
+ * User configurable property, influences whether or not
+ * the `showDiff` flag should be included in the thrown
+ * AssertionErrors. `false` will always be `false`; `true`
+ * will be true when the assertion has requested a diff
+ * be shown.
+ *
+ * @param {Boolean}
+ * @api public
+ */
+
+ showDiff: true,
+
+ /**
+ * ### config.truncateThreshold
+ *
+ * User configurable property, sets length threshold for actual and
+ * expected values in assertion errors. If this threshold is exceeded, for
+ * example for large data structures, the value is replaced with something
+ * like `[ Array(3) ]` or `{ Object (prop1, prop2) }`.
+ *
+ * Set it to zero if you want to disable truncating altogether.
+ *
+ * This is especially useful when doing assertions on arrays: having this
+ * set to a reasonable large value makes the failure messages readily
+ * inspectable.
+ *
+ * chai.config.truncateThreshold = 0; // disable truncating
+ *
+ * @param {Number}
+ * @api public
+ */
+
+ truncateThreshold: 40,
+
+ /**
+ * ### config.useProxy
+ *
+ * User configurable property, defines if chai will use a Proxy to throw
+ * an error when a non-existent property is read, which protects users
+ * from typos when using property-based assertions.
+ *
+ * Set it to false if you want to disable this feature.
+ *
+ * chai.config.useProxy = false; // disable use of Proxy
+ *
+ * This feature is automatically disabled regardless of this config value
+ * in environments that don't support proxies.
+ *
+ * @param {Boolean}
+ * @api public
+ */
+
+ useProxy: true,
+
+ /**
+ * ### config.proxyExcludedKeys
+ *
+ * User configurable property, defines which properties should be ignored
+ * instead of throwing an error if they do not exist on the assertion.
+ * This is only applied if the environment Chai is running in supports proxies and
+ * if the `useProxy` configuration setting is enabled.
+ * By default, `then` and `inspect` will not throw an error if they do not exist on the
+ * assertion object because the `.inspect` property is read by `util.inspect` (for example, when
+ * using `console.log` on the assertion object) and `.then` is necessary for promise type-checking.
+ *
+ * // By default these keys will not throw an error if they do not exist on the assertion object
+ * chai.config.proxyExcludedKeys = ['then', 'inspect'];
+ *
+ * @param {Array}
+ * @api public
+ */
+
+ proxyExcludedKeys: ['then', 'catch', 'inspect', 'toJSON']
+};
+
+},{}],5:[function(require,module,exports){
+/*!
+ * chai
+ * http://chaijs.com
+ * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+module.exports = function (chai, _) {
+ var Assertion = chai.Assertion
+ , AssertionError = chai.AssertionError
+ , flag = _.flag;
+
+ /**
+ * ### Language Chains
+ *
+ * The following are provided as chainable getters to improve the readability
+ * of your assertions.
+ *
+ * **Chains**
+ *
+ * - to
+ * - be
+ * - been
+ * - is
+ * - that
+ * - which
+ * - and
+ * - has
+ * - have
+ * - with
+ * - at
+ * - of
+ * - same
+ * - but
+ * - does
+ * - still
+ *
+ * @name language chains
+ * @namespace BDD
+ * @api public
+ */
+
+ [ 'to', 'be', 'been', 'is'
+ , 'and', 'has', 'have', 'with'
+ , 'that', 'which', 'at', 'of'
+ , 'same', 'but', 'does', 'still' ].forEach(function (chain) {
+ Assertion.addProperty(chain);
+ });
+
+ /**
+ * ### .not
+ *
+ * Negates all assertions that follow in the chain.
+ *
+ * expect(function () {}).to.not.throw();
+ * expect({a: 1}).to.not.have.property('b');
+ * expect([1, 2]).to.be.an('array').that.does.not.include(3);
+ *
+ * Just because you can negate any assertion with `.not` doesn't mean you
+ * should. With great power comes great responsibility. It's often best to
+ * assert that the one expected output was produced, rather than asserting
+ * that one of countless unexpected outputs wasn't produced. See individual
+ * assertions for specific guidance.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(2).to.not.equal(1); // Not recommended
+ *
+ * @name not
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('not', function () {
+ flag(this, 'negate', true);
+ });
+
+ /**
+ * ### .deep
+ *
+ * Causes all `.equal`, `.include`, `.members`, `.keys`, and `.property`
+ * assertions that follow in the chain to use deep equality instead of strict
+ * (`===`) equality. See the `deep-eql` project page for info on the deep
+ * equality algorithm: https://github.com/chaijs/deep-eql.
+ *
+ * // Target object deeply (but not strictly) equals `{a: 1}`
+ * expect({a: 1}).to.deep.equal({a: 1});
+ * expect({a: 1}).to.not.equal({a: 1});
+ *
+ * // Target array deeply (but not strictly) includes `{a: 1}`
+ * expect([{a: 1}]).to.deep.include({a: 1});
+ * expect([{a: 1}]).to.not.include({a: 1});
+ *
+ * // Target object deeply (but not strictly) includes `x: {a: 1}`
+ * expect({x: {a: 1}}).to.deep.include({x: {a: 1}});
+ * expect({x: {a: 1}}).to.not.include({x: {a: 1}});
+ *
+ * // Target array deeply (but not strictly) has member `{a: 1}`
+ * expect([{a: 1}]).to.have.deep.members([{a: 1}]);
+ * expect([{a: 1}]).to.not.have.members([{a: 1}]);
+ *
+ * // Target set deeply (but not strictly) has key `{a: 1}`
+ * expect(new Set([{a: 1}])).to.have.deep.keys([{a: 1}]);
+ * expect(new Set([{a: 1}])).to.not.have.keys([{a: 1}]);
+ *
+ * // Target object deeply (but not strictly) has property `x: {a: 1}`
+ * expect({x: {a: 1}}).to.have.deep.property('x', {a: 1});
+ * expect({x: {a: 1}}).to.not.have.property('x', {a: 1});
+ *
+ * @name deep
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('deep', function () {
+ flag(this, 'deep', true);
+ });
+
+ /**
+ * ### .nested
+ *
+ * Enables dot- and bracket-notation in all `.property` and `.include`
+ * assertions that follow in the chain.
+ *
+ * expect({a: {b: ['x', 'y']}}).to.have.nested.property('a.b[1]');
+ * expect({a: {b: ['x', 'y']}}).to.nested.include({'a.b[1]': 'y'});
+ *
+ * If `.` or `[]` are part of an actual property name, they can be escaped by
+ * adding two backslashes before them.
+ *
+ * expect({'.a': {'[b]': 'x'}}).to.have.nested.property('\\.a.\\[b\\]');
+ * expect({'.a': {'[b]': 'x'}}).to.nested.include({'\\.a.\\[b\\]': 'x'});
+ *
+ * `.nested` cannot be combined with `.own`.
+ *
+ * @name nested
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('nested', function () {
+ flag(this, 'nested', true);
+ });
+
+ /**
+ * ### .own
+ *
+ * Causes all `.property` and `.include` assertions that follow in the chain
+ * to ignore inherited properties.
+ *
+ * Object.prototype.b = 2;
+ *
+ * expect({a: 1}).to.have.own.property('a');
+ * expect({a: 1}).to.have.property('b');
+ * expect({a: 1}).to.not.have.own.property('b');
+ *
+ * expect({a: 1}).to.own.include({a: 1});
+ * expect({a: 1}).to.include({b: 2}).but.not.own.include({b: 2});
+ *
+ * `.own` cannot be combined with `.nested`.
+ *
+ * @name own
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('own', function () {
+ flag(this, 'own', true);
+ });
+
+ /**
+ * ### .ordered
+ *
+ * Causes all `.members` assertions that follow in the chain to require that
+ * members be in the same order.
+ *
+ * expect([1, 2]).to.have.ordered.members([1, 2])
+ * .but.not.have.ordered.members([2, 1]);
+ *
+ * When `.include` and `.ordered` are combined, the ordering begins at the
+ * start of both arrays.
+ *
+ * expect([1, 2, 3]).to.include.ordered.members([1, 2])
+ * .but.not.include.ordered.members([2, 3]);
+ *
+ * @name ordered
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('ordered', function () {
+ flag(this, 'ordered', true);
+ });
+
+ /**
+ * ### .any
+ *
+ * Causes all `.keys` assertions that follow in the chain to only require that
+ * the target have at least one of the given keys. This is the opposite of
+ * `.all`, which requires that the target have all of the given keys.
+ *
+ * expect({a: 1, b: 2}).to.not.have.any.keys('c', 'd');
+ *
+ * See the `.keys` doc for guidance on when to use `.any` or `.all`.
+ *
+ * @name any
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('any', function () {
+ flag(this, 'any', true);
+ flag(this, 'all', false);
+ });
+
+ /**
+ * ### .all
+ *
+ * Causes all `.keys` assertions that follow in the chain to require that the
+ * target have all of the given keys. This is the opposite of `.any`, which
+ * only requires that the target have at least one of the given keys.
+ *
+ * expect({a: 1, b: 2}).to.have.all.keys('a', 'b');
+ *
+ * Note that `.all` is used by default when neither `.all` nor `.any` are
+ * added earlier in the chain. However, it's often best to add `.all` anyway
+ * because it improves readability.
+ *
+ * See the `.keys` doc for guidance on when to use `.any` or `.all`.
+ *
+ * @name all
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('all', function () {
+ flag(this, 'all', true);
+ flag(this, 'any', false);
+ });
+
+ /**
+ * ### .a(type[, msg])
+ *
+ * Asserts that the target's type is equal to the given string `type`. Types
+ * are case insensitive. See the `type-detect` project page for info on the
+ * type detection algorithm: https://github.com/chaijs/type-detect.
+ *
+ * expect('foo').to.be.a('string');
+ * expect({a: 1}).to.be.an('object');
+ * expect(null).to.be.a('null');
+ * expect(undefined).to.be.an('undefined');
+ * expect(new Error).to.be.an('error');
+ * expect(Promise.resolve()).to.be.a('promise');
+ * expect(new Float32Array).to.be.a('float32array');
+ * expect(Symbol()).to.be.a('symbol');
+ *
+ * `.a` supports objects that have a custom type set via `Symbol.toStringTag`.
+ *
+ * var myObj = {
+ * [Symbol.toStringTag]: 'myCustomType'
+ * };
+ *
+ * expect(myObj).to.be.a('myCustomType').but.not.an('object');
+ *
+ * It's often best to use `.a` to check a target's type before making more
+ * assertions on the same target. That way, you avoid unexpected behavior from
+ * any assertion that does different things based on the target's type.
+ *
+ * expect([1, 2, 3]).to.be.an('array').that.includes(2);
+ * expect([]).to.be.an('array').that.is.empty;
+ *
+ * Add `.not` earlier in the chain to negate `.a`. However, it's often best to
+ * assert that the target is the expected type, rather than asserting that it
+ * isn't one of many unexpected types.
+ *
+ * expect('foo').to.be.a('string'); // Recommended
+ * expect('foo').to.not.be.an('array'); // Not recommended
+ *
+ * `.a` accepts an optional `msg` argument which is a custom error message to
+ * show when the assertion fails. The message can also be given as the second
+ * argument to `expect`.
+ *
+ * expect(1).to.be.a('string', 'nooo why fail??');
+ * expect(1, 'nooo why fail??').to.be.a('string');
+ *
+ * `.a` can also be used as a language chain to improve the readability of
+ * your assertions.
+ *
+ * expect({b: 2}).to.have.a.property('b');
+ *
+ * The alias `.an` can be used interchangeably with `.a`.
+ *
+ * @name a
+ * @alias an
+ * @param {String} type
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function an (type, msg) {
+ if (msg) flag(this, 'message', msg);
+ type = type.toLowerCase();
+ var obj = flag(this, 'object')
+ , article = ~[ 'a', 'e', 'i', 'o', 'u' ].indexOf(type.charAt(0)) ? 'an ' : 'a ';
+
+ this.assert(
+ type === _.type(obj).toLowerCase()
+ , 'expected #{this} to be ' + article + type
+ , 'expected #{this} not to be ' + article + type
+ );
+ }
+
+ Assertion.addChainableMethod('an', an);
+ Assertion.addChainableMethod('a', an);
+
+ /**
+ * ### .include(val[, msg])
+ *
+ * When the target is a string, `.include` asserts that the given string `val`
+ * is a substring of the target.
+ *
+ * expect('foobar').to.include('foo');
+ *
+ * When the target is an array, `.include` asserts that the given `val` is a
+ * member of the target.
+ *
+ * expect([1, 2, 3]).to.include(2);
+ *
+ * When the target is an object, `.include` asserts that the given object
+ * `val`'s properties are a subset of the target's properties.
+ *
+ * expect({a: 1, b: 2, c: 3}).to.include({a: 1, b: 2});
+ *
+ * When the target is a Set or WeakSet, `.include` asserts that the given `val` is a
+ * member of the target. SameValueZero equality algorithm is used.
+ *
+ * expect(new Set([1, 2])).to.include(2);
+ *
+ * When the target is a Map, `.include` asserts that the given `val` is one of
+ * the values of the target. SameValueZero equality algorithm is used.
+ *
+ * expect(new Map([['a', 1], ['b', 2]])).to.include(2);
+ *
+ * Because `.include` does different things based on the target's type, it's
+ * important to check the target's type before using `.include`. See the `.a`
+ * doc for info on testing a target's type.
+ *
+ * expect([1, 2, 3]).to.be.an('array').that.includes(2);
+ *
+ * By default, strict (`===`) equality is used to compare array members and
+ * object properties. Add `.deep` earlier in the chain to use deep equality
+ * instead (WeakSet targets are not supported). See the `deep-eql` project
+ * page for info on the deep equality algorithm: https://github.com/chaijs/deep-eql.
+ *
+ * // Target array deeply (but not strictly) includes `{a: 1}`
+ * expect([{a: 1}]).to.deep.include({a: 1});
+ * expect([{a: 1}]).to.not.include({a: 1});
+ *
+ * // Target object deeply (but not strictly) includes `x: {a: 1}`
+ * expect({x: {a: 1}}).to.deep.include({x: {a: 1}});
+ * expect({x: {a: 1}}).to.not.include({x: {a: 1}});
+ *
+ * By default, all of the target's properties are searched when working with
+ * objects. This includes properties that are inherited and/or non-enumerable.
+ * Add `.own` earlier in the chain to exclude the target's inherited
+ * properties from the search.
+ *
+ * Object.prototype.b = 2;
+ *
+ * expect({a: 1}).to.own.include({a: 1});
+ * expect({a: 1}).to.include({b: 2}).but.not.own.include({b: 2});
+ *
+ * Note that a target object is always only searched for `val`'s own
+ * enumerable properties.
+ *
+ * `.deep` and `.own` can be combined.
+ *
+ * expect({a: {b: 2}}).to.deep.own.include({a: {b: 2}});
+ *
+ * Add `.nested` earlier in the chain to enable dot- and bracket-notation when
+ * referencing nested properties.
+ *
+ * expect({a: {b: ['x', 'y']}}).to.nested.include({'a.b[1]': 'y'});
+ *
+ * If `.` or `[]` are part of an actual property name, they can be escaped by
+ * adding two backslashes before them.
+ *
+ * expect({'.a': {'[b]': 2}}).to.nested.include({'\\.a.\\[b\\]': 2});
+ *
+ * `.deep` and `.nested` can be combined.
+ *
+ * expect({a: {b: [{c: 3}]}}).to.deep.nested.include({'a.b[0]': {c: 3}});
+ *
+ * `.own` and `.nested` cannot be combined.
+ *
+ * Add `.not` earlier in the chain to negate `.include`.
+ *
+ * expect('foobar').to.not.include('taco');
+ * expect([1, 2, 3]).to.not.include(4);
+ *
+ * However, it's dangerous to negate `.include` when the target is an object.
+ * The problem is that it creates uncertain expectations by asserting that the
+ * target object doesn't have all of `val`'s key/value pairs but may or may
+ * not have some of them. It's often best to identify the exact output that's
+ * expected, and then write an assertion that only accepts that exact output.
+ *
+ * When the target object isn't even expected to have `val`'s keys, it's
+ * often best to assert exactly that.
+ *
+ * expect({c: 3}).to.not.have.any.keys('a', 'b'); // Recommended
+ * expect({c: 3}).to.not.include({a: 1, b: 2}); // Not recommended
+ *
+ * When the target object is expected to have `val`'s keys, it's often best to
+ * assert that each of the properties has its expected value, rather than
+ * asserting that each property doesn't have one of many unexpected values.
+ *
+ * expect({a: 3, b: 4}).to.include({a: 3, b: 4}); // Recommended
+ * expect({a: 3, b: 4}).to.not.include({a: 1, b: 2}); // Not recommended
+ *
+ * `.include` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect([1, 2, 3]).to.include(4, 'nooo why fail??');
+ * expect([1, 2, 3], 'nooo why fail??').to.include(4);
+ *
+ * `.include` can also be used as a language chain, causing all `.members` and
+ * `.keys` assertions that follow in the chain to require the target to be a
+ * superset of the expected set, rather than an identical set. Note that
+ * `.members` ignores duplicates in the subset when `.include` is added.
+ *
+ * // Target object's keys are a superset of ['a', 'b'] but not identical
+ * expect({a: 1, b: 2, c: 3}).to.include.all.keys('a', 'b');
+ * expect({a: 1, b: 2, c: 3}).to.not.have.all.keys('a', 'b');
+ *
+ * // Target array is a superset of [1, 2] but not identical
+ * expect([1, 2, 3]).to.include.members([1, 2]);
+ * expect([1, 2, 3]).to.not.have.members([1, 2]);
+ *
+ * // Duplicates in the subset are ignored
+ * expect([1, 2, 3]).to.include.members([1, 2, 2, 2]);
+ *
+ * Note that adding `.any` earlier in the chain causes the `.keys` assertion
+ * to ignore `.include`.
+ *
+ * // Both assertions are identical
+ * expect({a: 1}).to.include.any.keys('a', 'b');
+ * expect({a: 1}).to.have.any.keys('a', 'b');
+ *
+ * The aliases `.includes`, `.contain`, and `.contains` can be used
+ * interchangeably with `.include`.
+ *
+ * @name include
+ * @alias contain
+ * @alias includes
+ * @alias contains
+ * @param {Mixed} val
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function SameValueZero(a, b) {
+ return (_.isNaN(a) && _.isNaN(b)) || a === b;
+ }
+
+ function includeChainingBehavior () {
+ flag(this, 'contains', true);
+ }
+
+ function include (val, msg) {
+ if (msg) flag(this, 'message', msg);
+
+ var obj = flag(this, 'object')
+ , objType = _.type(obj).toLowerCase()
+ , flagMsg = flag(this, 'message')
+ , negate = flag(this, 'negate')
+ , ssfi = flag(this, 'ssfi')
+ , isDeep = flag(this, 'deep')
+ , descriptor = isDeep ? 'deep ' : '';
+
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+
+ var included = false;
+
+ switch (objType) {
+ case 'string':
+ included = obj.indexOf(val) !== -1;
+ break;
+
+ case 'weakset':
+ if (isDeep) {
+ throw new AssertionError(
+ flagMsg + 'unable to use .deep.include with WeakSet',
+ undefined,
+ ssfi
+ );
+ }
+
+ included = obj.has(val);
+ break;
+
+ case 'map':
+ var isEql = isDeep ? _.eql : SameValueZero;
+ obj.forEach(function (item) {
+ included = included || isEql(item, val);
+ });
+ break;
+
+ case 'set':
+ if (isDeep) {
+ obj.forEach(function (item) {
+ included = included || _.eql(item, val);
+ });
+ } else {
+ included = obj.has(val);
+ }
+ break;
+
+ case 'array':
+ if (isDeep) {
+ included = obj.some(function (item) {
+ return _.eql(item, val);
+ })
+ } else {
+ included = obj.indexOf(val) !== -1;
+ }
+ break;
+
+ default:
+ // This block is for asserting a subset of properties in an object.
+ // `_.expectTypes` isn't used here because `.include` should work with
+ // objects with a custom `@@toStringTag`.
+ if (val !== Object(val)) {
+ throw new AssertionError(
+ flagMsg + 'object tested must be an array, a map, an object,'
+ + ' a set, a string, or a weakset, but ' + objType + ' given',
+ undefined,
+ ssfi
+ );
+ }
+
+ var props = Object.keys(val)
+ , firstErr = null
+ , numErrs = 0;
+
+ props.forEach(function (prop) {
+ var propAssertion = new Assertion(obj);
+ _.transferFlags(this, propAssertion, true);
+ flag(propAssertion, 'lockSsfi', true);
+
+ if (!negate || props.length === 1) {
+ propAssertion.property(prop, val[prop]);
+ return;
+ }
+
+ try {
+ propAssertion.property(prop, val[prop]);
+ } catch (err) {
+ if (!_.checkError.compatibleConstructor(err, AssertionError)) {
+ throw err;
+ }
+ if (firstErr === null) firstErr = err;
+ numErrs++;
+ }
+ }, this);
+
+ // When validating .not.include with multiple properties, we only want
+ // to throw an assertion error if all of the properties are included,
+ // in which case we throw the first property assertion error that we
+ // encountered.
+ if (negate && props.length > 1 && numErrs === props.length) {
+ throw firstErr;
+ }
+ return;
+ }
+
+ // Assert inclusion in collection or substring in a string.
+ this.assert(
+ included
+ , 'expected #{this} to ' + descriptor + 'include ' + _.inspect(val)
+ , 'expected #{this} to not ' + descriptor + 'include ' + _.inspect(val));
+ }
+
+ Assertion.addChainableMethod('include', include, includeChainingBehavior);
+ Assertion.addChainableMethod('contain', include, includeChainingBehavior);
+ Assertion.addChainableMethod('contains', include, includeChainingBehavior);
+ Assertion.addChainableMethod('includes', include, includeChainingBehavior);
+
+ /**
+ * ### .ok
+ *
+ * Asserts that the target is a truthy value (considered `true` in boolean context).
+ * However, it's often best to assert that the target is strictly (`===`) or
+ * deeply equal to its expected value.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.be.ok; // Not recommended
+ *
+ * expect(true).to.be.true; // Recommended
+ * expect(true).to.be.ok; // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.ok`.
+ *
+ * expect(0).to.equal(0); // Recommended
+ * expect(0).to.not.be.ok; // Not recommended
+ *
+ * expect(false).to.be.false; // Recommended
+ * expect(false).to.not.be.ok; // Not recommended
+ *
+ * expect(null).to.be.null; // Recommended
+ * expect(null).to.not.be.ok; // Not recommended
+ *
+ * expect(undefined).to.be.undefined; // Recommended
+ * expect(undefined).to.not.be.ok; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(false, 'nooo why fail??').to.be.ok;
+ *
+ * @name ok
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('ok', function () {
+ this.assert(
+ flag(this, 'object')
+ , 'expected #{this} to be truthy'
+ , 'expected #{this} to be falsy');
+ });
+
+ /**
+ * ### .true
+ *
+ * Asserts that the target is strictly (`===`) equal to `true`.
+ *
+ * expect(true).to.be.true;
+ *
+ * Add `.not` earlier in the chain to negate `.true`. However, it's often best
+ * to assert that the target is equal to its expected value, rather than not
+ * equal to `true`.
+ *
+ * expect(false).to.be.false; // Recommended
+ * expect(false).to.not.be.true; // Not recommended
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.true; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(false, 'nooo why fail??').to.be.true;
+ *
+ * @name true
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('true', function () {
+ this.assert(
+ true === flag(this, 'object')
+ , 'expected #{this} to be true'
+ , 'expected #{this} to be false'
+ , flag(this, 'negate') ? false : true
+ );
+ });
+
+ /**
+ * ### .false
+ *
+ * Asserts that the target is strictly (`===`) equal to `false`.
+ *
+ * expect(false).to.be.false;
+ *
+ * Add `.not` earlier in the chain to negate `.false`. However, it's often
+ * best to assert that the target is equal to its expected value, rather than
+ * not equal to `false`.
+ *
+ * expect(true).to.be.true; // Recommended
+ * expect(true).to.not.be.false; // Not recommended
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.false; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(true, 'nooo why fail??').to.be.false;
+ *
+ * @name false
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('false', function () {
+ this.assert(
+ false === flag(this, 'object')
+ , 'expected #{this} to be false'
+ , 'expected #{this} to be true'
+ , flag(this, 'negate') ? true : false
+ );
+ });
+
+ /**
+ * ### .null
+ *
+ * Asserts that the target is strictly (`===`) equal to `null`.
+ *
+ * expect(null).to.be.null;
+ *
+ * Add `.not` earlier in the chain to negate `.null`. However, it's often best
+ * to assert that the target is equal to its expected value, rather than not
+ * equal to `null`.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.null; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(42, 'nooo why fail??').to.be.null;
+ *
+ * @name null
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('null', function () {
+ this.assert(
+ null === flag(this, 'object')
+ , 'expected #{this} to be null'
+ , 'expected #{this} not to be null'
+ );
+ });
+
+ /**
+ * ### .undefined
+ *
+ * Asserts that the target is strictly (`===`) equal to `undefined`.
+ *
+ * expect(undefined).to.be.undefined;
+ *
+ * Add `.not` earlier in the chain to negate `.undefined`. However, it's often
+ * best to assert that the target is equal to its expected value, rather than
+ * not equal to `undefined`.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.undefined; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(42, 'nooo why fail??').to.be.undefined;
+ *
+ * @name undefined
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('undefined', function () {
+ this.assert(
+ undefined === flag(this, 'object')
+ , 'expected #{this} to be undefined'
+ , 'expected #{this} not to be undefined'
+ );
+ });
+
+ /**
+ * ### .NaN
+ *
+ * Asserts that the target is exactly `NaN`.
+ *
+ * expect(NaN).to.be.NaN;
+ *
+ * Add `.not` earlier in the chain to negate `.NaN`. However, it's often best
+ * to assert that the target is equal to its expected value, rather than not
+ * equal to `NaN`.
+ *
+ * expect('foo').to.equal('foo'); // Recommended
+ * expect('foo').to.not.be.NaN; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(42, 'nooo why fail??').to.be.NaN;
+ *
+ * @name NaN
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('NaN', function () {
+ this.assert(
+ _.isNaN(flag(this, 'object'))
+ , 'expected #{this} to be NaN'
+ , 'expected #{this} not to be NaN'
+ );
+ });
+
+ /**
+ * ### .exist
+ *
+ * Asserts that the target is not strictly (`===`) equal to either `null` or
+ * `undefined`. However, it's often best to assert that the target is equal to
+ * its expected value.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.exist; // Not recommended
+ *
+ * expect(0).to.equal(0); // Recommended
+ * expect(0).to.exist; // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.exist`.
+ *
+ * expect(null).to.be.null; // Recommended
+ * expect(null).to.not.exist; // Not recommended
+ *
+ * expect(undefined).to.be.undefined; // Recommended
+ * expect(undefined).to.not.exist; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(null, 'nooo why fail??').to.exist;
+ *
+ * @name exist
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('exist', function () {
+ var val = flag(this, 'object');
+ this.assert(
+ val !== null && val !== undefined
+ , 'expected #{this} to exist'
+ , 'expected #{this} to not exist'
+ );
+ });
+
+ /**
+ * ### .empty
+ *
+ * When the target is a string or array, `.empty` asserts that the target's
+ * `length` property is strictly (`===`) equal to `0`.
+ *
+ * expect([]).to.be.empty;
+ * expect('').to.be.empty;
+ *
+ * When the target is a map or set, `.empty` asserts that the target's `size`
+ * property is strictly equal to `0`.
+ *
+ * expect(new Set()).to.be.empty;
+ * expect(new Map()).to.be.empty;
+ *
+ * When the target is a non-function object, `.empty` asserts that the target
+ * doesn't have any own enumerable properties. Properties with Symbol-based
+ * keys are excluded from the count.
+ *
+ * expect({}).to.be.empty;
+ *
+ * Because `.empty` does different things based on the target's type, it's
+ * important to check the target's type before using `.empty`. See the `.a`
+ * doc for info on testing a target's type.
+ *
+ * expect([]).to.be.an('array').that.is.empty;
+ *
+ * Add `.not` earlier in the chain to negate `.empty`. However, it's often
+ * best to assert that the target contains its expected number of values,
+ * rather than asserting that it's not empty.
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(3); // Recommended
+ * expect([1, 2, 3]).to.not.be.empty; // Not recommended
+ *
+ * expect(new Set([1, 2, 3])).to.have.property('size', 3); // Recommended
+ * expect(new Set([1, 2, 3])).to.not.be.empty; // Not recommended
+ *
+ * expect(Object.keys({a: 1})).to.have.lengthOf(1); // Recommended
+ * expect({a: 1}).to.not.be.empty; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect([1, 2, 3], 'nooo why fail??').to.be.empty;
+ *
+ * @name empty
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('empty', function () {
+ var val = flag(this, 'object')
+ , ssfi = flag(this, 'ssfi')
+ , flagMsg = flag(this, 'message')
+ , itemsCount;
+
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+
+ switch (_.type(val).toLowerCase()) {
+ case 'array':
+ case 'string':
+ itemsCount = val.length;
+ break;
+ case 'map':
+ case 'set':
+ itemsCount = val.size;
+ break;
+ case 'weakmap':
+ case 'weakset':
+ throw new AssertionError(
+ flagMsg + '.empty was passed a weak collection',
+ undefined,
+ ssfi
+ );
+ case 'function':
+ var msg = flagMsg + '.empty was passed a function ' + _.getName(val);
+ throw new AssertionError(msg.trim(), undefined, ssfi);
+ default:
+ if (val !== Object(val)) {
+ throw new AssertionError(
+ flagMsg + '.empty was passed non-string primitive ' + _.inspect(val),
+ undefined,
+ ssfi
+ );
+ }
+ itemsCount = Object.keys(val).length;
+ }
+
+ this.assert(
+ 0 === itemsCount
+ , 'expected #{this} to be empty'
+ , 'expected #{this} not to be empty'
+ );
+ });
+
+ /**
+ * ### .arguments
+ *
+ * Asserts that the target is an `arguments` object.
+ *
+ * function test () {
+ * expect(arguments).to.be.arguments;
+ * }
+ *
+ * test();
+ *
+ * Add `.not` earlier in the chain to negate `.arguments`. However, it's often
+ * best to assert which type the target is expected to be, rather than
+ * asserting that its not an `arguments` object.
+ *
+ * expect('foo').to.be.a('string'); // Recommended
+ * expect('foo').to.not.be.arguments; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect({}, 'nooo why fail??').to.be.arguments;
+ *
+ * The alias `.Arguments` can be used interchangeably with `.arguments`.
+ *
+ * @name arguments
+ * @alias Arguments
+ * @namespace BDD
+ * @api public
+ */
+
+ function checkArguments () {
+ var obj = flag(this, 'object')
+ , type = _.type(obj);
+ this.assert(
+ 'Arguments' === type
+ , 'expected #{this} to be arguments but got ' + type
+ , 'expected #{this} to not be arguments'
+ );
+ }
+
+ Assertion.addProperty('arguments', checkArguments);
+ Assertion.addProperty('Arguments', checkArguments);
+
+ /**
+ * ### .equal(val[, msg])
+ *
+ * Asserts that the target is strictly (`===`) equal to the given `val`.
+ *
+ * expect(1).to.equal(1);
+ * expect('foo').to.equal('foo');
+ *
+ * Add `.deep` earlier in the chain to use deep equality instead. See the
+ * `deep-eql` project page for info on the deep equality algorithm:
+ * https://github.com/chaijs/deep-eql.
+ *
+ * // Target object deeply (but not strictly) equals `{a: 1}`
+ * expect({a: 1}).to.deep.equal({a: 1});
+ * expect({a: 1}).to.not.equal({a: 1});
+ *
+ * // Target array deeply (but not strictly) equals `[1, 2]`
+ * expect([1, 2]).to.deep.equal([1, 2]);
+ * expect([1, 2]).to.not.equal([1, 2]);
+ *
+ * Add `.not` earlier in the chain to negate `.equal`. However, it's often
+ * best to assert that the target is equal to its expected value, rather than
+ * not equal to one of countless unexpected values.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.equal(2); // Not recommended
+ *
+ * `.equal` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect(1).to.equal(2, 'nooo why fail??');
+ * expect(1, 'nooo why fail??').to.equal(2);
+ *
+ * The aliases `.equals` and `eq` can be used interchangeably with `.equal`.
+ *
+ * @name equal
+ * @alias equals
+ * @alias eq
+ * @param {Mixed} val
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertEqual (val, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object');
+ if (flag(this, 'deep')) {
+ var prevLockSsfi = flag(this, 'lockSsfi');
+ flag(this, 'lockSsfi', true);
+ this.eql(val);
+ flag(this, 'lockSsfi', prevLockSsfi);
+ } else {
+ this.assert(
+ val === obj
+ , 'expected #{this} to equal #{exp}'
+ , 'expected #{this} to not equal #{exp}'
+ , val
+ , this._obj
+ , true
+ );
+ }
+ }
+
+ Assertion.addMethod('equal', assertEqual);
+ Assertion.addMethod('equals', assertEqual);
+ Assertion.addMethod('eq', assertEqual);
+
+ /**
+ * ### .eql(obj[, msg])
+ *
+ * Asserts that the target is deeply equal to the given `obj`. See the
+ * `deep-eql` project page for info on the deep equality algorithm:
+ * https://github.com/chaijs/deep-eql.
+ *
+ * // Target object is deeply (but not strictly) equal to {a: 1}
+ * expect({a: 1}).to.eql({a: 1}).but.not.equal({a: 1});
+ *
+ * // Target array is deeply (but not strictly) equal to [1, 2]
+ * expect([1, 2]).to.eql([1, 2]).but.not.equal([1, 2]);
+ *
+ * Add `.not` earlier in the chain to negate `.eql`. However, it's often best
+ * to assert that the target is deeply equal to its expected value, rather
+ * than not deeply equal to one of countless unexpected values.
+ *
+ * expect({a: 1}).to.eql({a: 1}); // Recommended
+ * expect({a: 1}).to.not.eql({b: 2}); // Not recommended
+ *
+ * `.eql` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect({a: 1}).to.eql({b: 2}, 'nooo why fail??');
+ * expect({a: 1}, 'nooo why fail??').to.eql({b: 2});
+ *
+ * The alias `.eqls` can be used interchangeably with `.eql`.
+ *
+ * The `.deep.equal` assertion is almost identical to `.eql` but with one
+ * difference: `.deep.equal` causes deep equality comparisons to also be used
+ * for any other assertions that follow in the chain.
+ *
+ * @name eql
+ * @alias eqls
+ * @param {Mixed} obj
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertEql(obj, msg) {
+ if (msg) flag(this, 'message', msg);
+ this.assert(
+ _.eql(obj, flag(this, 'object'))
+ , 'expected #{this} to deeply equal #{exp}'
+ , 'expected #{this} to not deeply equal #{exp}'
+ , obj
+ , this._obj
+ , true
+ );
+ }
+
+ Assertion.addMethod('eql', assertEql);
+ Assertion.addMethod('eqls', assertEql);
+
+ /**
+ * ### .above(n[, msg])
+ *
+ * Asserts that the target is a number or a date greater than the given number or date `n` respectively.
+ * However, it's often best to assert that the target is equal to its expected
+ * value.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(2).to.be.above(1); // Not recommended
+ *
+ * Add `.lengthOf` earlier in the chain to assert that the target's `length`
+ * or `size` is greater than the given number `n`.
+ *
+ * expect('foo').to.have.lengthOf(3); // Recommended
+ * expect('foo').to.have.lengthOf.above(2); // Not recommended
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(3); // Recommended
+ * expect([1, 2, 3]).to.have.lengthOf.above(2); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.above`.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(1).to.not.be.above(2); // Not recommended
+ *
+ * `.above` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect(1).to.be.above(2, 'nooo why fail??');
+ * expect(1, 'nooo why fail??').to.be.above(2);
+ *
+ * The aliases `.gt` and `.greaterThan` can be used interchangeably with
+ * `.above`.
+ *
+ * @name above
+ * @alias gt
+ * @alias greaterThan
+ * @param {Number} n
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertAbove (n, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , doLength = flag(this, 'doLength')
+ , flagMsg = flag(this, 'message')
+ , msgPrefix = ((flagMsg) ? flagMsg + ': ' : '')
+ , ssfi = flag(this, 'ssfi')
+ , objType = _.type(obj).toLowerCase()
+ , nType = _.type(n).toLowerCase()
+ , errorMessage
+ , shouldThrow = true;
+
+ if (doLength && objType !== 'map' && objType !== 'set') {
+ new Assertion(obj, flagMsg, ssfi, true).to.have.property('length');
+ }
+
+ if (!doLength && (objType === 'date' && nType !== 'date')) {
+ errorMessage = msgPrefix + 'the argument to above must be a date';
+ } else if (nType !== 'number' && (doLength || objType === 'number')) {
+ errorMessage = msgPrefix + 'the argument to above must be a number';
+ } else if (!doLength && (objType !== 'date' && objType !== 'number')) {
+ var printObj = (objType === 'string') ? "'" + obj + "'" : obj;
+ errorMessage = msgPrefix + 'expected ' + printObj + ' to be a number or a date';
+ } else {
+ shouldThrow = false;
+ }
+
+ if (shouldThrow) {
+ throw new AssertionError(errorMessage, undefined, ssfi);
+ }
+
+ if (doLength) {
+ var descriptor = 'length'
+ , itemsCount;
+ if (objType === 'map' || objType === 'set') {
+ descriptor = 'size';
+ itemsCount = obj.size;
+ } else {
+ itemsCount = obj.length;
+ }
+ this.assert(
+ itemsCount > n
+ , 'expected #{this} to have a ' + descriptor + ' above #{exp} but got #{act}'
+ , 'expected #{this} to not have a ' + descriptor + ' above #{exp}'
+ , n
+ , itemsCount
+ );
+ } else {
+ this.assert(
+ obj > n
+ , 'expected #{this} to be above #{exp}'
+ , 'expected #{this} to be at most #{exp}'
+ , n
+ );
+ }
+ }
+
+ Assertion.addMethod('above', assertAbove);
+ Assertion.addMethod('gt', assertAbove);
+ Assertion.addMethod('greaterThan', assertAbove);
+
+ /**
+ * ### .least(n[, msg])
+ *
+ * Asserts that the target is a number or a date greater than or equal to the given
+ * number or date `n` respectively. However, it's often best to assert that the target is equal to
+ * its expected value.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(2).to.be.at.least(1); // Not recommended
+ * expect(2).to.be.at.least(2); // Not recommended
+ *
+ * Add `.lengthOf` earlier in the chain to assert that the target's `length`
+ * or `size` is greater than or equal to the given number `n`.
+ *
+ * expect('foo').to.have.lengthOf(3); // Recommended
+ * expect('foo').to.have.lengthOf.at.least(2); // Not recommended
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(3); // Recommended
+ * expect([1, 2, 3]).to.have.lengthOf.at.least(2); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.least`.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.at.least(2); // Not recommended
+ *
+ * `.least` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect(1).to.be.at.least(2, 'nooo why fail??');
+ * expect(1, 'nooo why fail??').to.be.at.least(2);
+ *
+ * The alias `.gte` can be used interchangeably with `.least`.
+ *
+ * @name least
+ * @alias gte
+ * @param {Number} n
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertLeast (n, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , doLength = flag(this, 'doLength')
+ , flagMsg = flag(this, 'message')
+ , msgPrefix = ((flagMsg) ? flagMsg + ': ' : '')
+ , ssfi = flag(this, 'ssfi')
+ , objType = _.type(obj).toLowerCase()
+ , nType = _.type(n).toLowerCase()
+ , errorMessage
+ , shouldThrow = true;
+
+ if (doLength && objType !== 'map' && objType !== 'set') {
+ new Assertion(obj, flagMsg, ssfi, true).to.have.property('length');
+ }
+
+ if (!doLength && (objType === 'date' && nType !== 'date')) {
+ errorMessage = msgPrefix + 'the argument to least must be a date';
+ } else if (nType !== 'number' && (doLength || objType === 'number')) {
+ errorMessage = msgPrefix + 'the argument to least must be a number';
+ } else if (!doLength && (objType !== 'date' && objType !== 'number')) {
+ var printObj = (objType === 'string') ? "'" + obj + "'" : obj;
+ errorMessage = msgPrefix + 'expected ' + printObj + ' to be a number or a date';
+ } else {
+ shouldThrow = false;
+ }
+
+ if (shouldThrow) {
+ throw new AssertionError(errorMessage, undefined, ssfi);
+ }
+
+ if (doLength) {
+ var descriptor = 'length'
+ , itemsCount;
+ if (objType === 'map' || objType === 'set') {
+ descriptor = 'size';
+ itemsCount = obj.size;
+ } else {
+ itemsCount = obj.length;
+ }
+ this.assert(
+ itemsCount >= n
+ , 'expected #{this} to have a ' + descriptor + ' at least #{exp} but got #{act}'
+ , 'expected #{this} to have a ' + descriptor + ' below #{exp}'
+ , n
+ , itemsCount
+ );
+ } else {
+ this.assert(
+ obj >= n
+ , 'expected #{this} to be at least #{exp}'
+ , 'expected #{this} to be below #{exp}'
+ , n
+ );
+ }
+ }
+
+ Assertion.addMethod('least', assertLeast);
+ Assertion.addMethod('gte', assertLeast);
+
+ /**
+ * ### .below(n[, msg])
+ *
+ * Asserts that the target is a number or a date less than the given number or date `n` respectively.
+ * However, it's often best to assert that the target is equal to its expected
+ * value.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.be.below(2); // Not recommended
+ *
+ * Add `.lengthOf` earlier in the chain to assert that the target's `length`
+ * or `size` is less than the given number `n`.
+ *
+ * expect('foo').to.have.lengthOf(3); // Recommended
+ * expect('foo').to.have.lengthOf.below(4); // Not recommended
+ *
+ * expect([1, 2, 3]).to.have.length(3); // Recommended
+ * expect([1, 2, 3]).to.have.lengthOf.below(4); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.below`.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(2).to.not.be.below(1); // Not recommended
+ *
+ * `.below` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect(2).to.be.below(1, 'nooo why fail??');
+ * expect(2, 'nooo why fail??').to.be.below(1);
+ *
+ * The aliases `.lt` and `.lessThan` can be used interchangeably with
+ * `.below`.
+ *
+ * @name below
+ * @alias lt
+ * @alias lessThan
+ * @param {Number} n
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertBelow (n, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , doLength = flag(this, 'doLength')
+ , flagMsg = flag(this, 'message')
+ , msgPrefix = ((flagMsg) ? flagMsg + ': ' : '')
+ , ssfi = flag(this, 'ssfi')
+ , objType = _.type(obj).toLowerCase()
+ , nType = _.type(n).toLowerCase()
+ , errorMessage
+ , shouldThrow = true;
+
+ if (doLength && objType !== 'map' && objType !== 'set') {
+ new Assertion(obj, flagMsg, ssfi, true).to.have.property('length');
+ }
+
+ if (!doLength && (objType === 'date' && nType !== 'date')) {
+ errorMessage = msgPrefix + 'the argument to below must be a date';
+ } else if (nType !== 'number' && (doLength || objType === 'number')) {
+ errorMessage = msgPrefix + 'the argument to below must be a number';
+ } else if (!doLength && (objType !== 'date' && objType !== 'number')) {
+ var printObj = (objType === 'string') ? "'" + obj + "'" : obj;
+ errorMessage = msgPrefix + 'expected ' + printObj + ' to be a number or a date';
+ } else {
+ shouldThrow = false;
+ }
+
+ if (shouldThrow) {
+ throw new AssertionError(errorMessage, undefined, ssfi);
+ }
+
+ if (doLength) {
+ var descriptor = 'length'
+ , itemsCount;
+ if (objType === 'map' || objType === 'set') {
+ descriptor = 'size';
+ itemsCount = obj.size;
+ } else {
+ itemsCount = obj.length;
+ }
+ this.assert(
+ itemsCount < n
+ , 'expected #{this} to have a ' + descriptor + ' below #{exp} but got #{act}'
+ , 'expected #{this} to not have a ' + descriptor + ' below #{exp}'
+ , n
+ , itemsCount
+ );
+ } else {
+ this.assert(
+ obj < n
+ , 'expected #{this} to be below #{exp}'
+ , 'expected #{this} to be at least #{exp}'
+ , n
+ );
+ }
+ }
+
+ Assertion.addMethod('below', assertBelow);
+ Assertion.addMethod('lt', assertBelow);
+ Assertion.addMethod('lessThan', assertBelow);
+
+ /**
+ * ### .most(n[, msg])
+ *
+ * Asserts that the target is a number or a date less than or equal to the given number
+ * or date `n` respectively. However, it's often best to assert that the target is equal to its
+ * expected value.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.be.at.most(2); // Not recommended
+ * expect(1).to.be.at.most(1); // Not recommended
+ *
+ * Add `.lengthOf` earlier in the chain to assert that the target's `length`
+ * or `size` is less than or equal to the given number `n`.
+ *
+ * expect('foo').to.have.lengthOf(3); // Recommended
+ * expect('foo').to.have.lengthOf.at.most(4); // Not recommended
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(3); // Recommended
+ * expect([1, 2, 3]).to.have.lengthOf.at.most(4); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.most`.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(2).to.not.be.at.most(1); // Not recommended
+ *
+ * `.most` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect(2).to.be.at.most(1, 'nooo why fail??');
+ * expect(2, 'nooo why fail??').to.be.at.most(1);
+ *
+ * The alias `.lte` can be used interchangeably with `.most`.
+ *
+ * @name most
+ * @alias lte
+ * @param {Number} n
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertMost (n, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , doLength = flag(this, 'doLength')
+ , flagMsg = flag(this, 'message')
+ , msgPrefix = ((flagMsg) ? flagMsg + ': ' : '')
+ , ssfi = flag(this, 'ssfi')
+ , objType = _.type(obj).toLowerCase()
+ , nType = _.type(n).toLowerCase()
+ , errorMessage
+ , shouldThrow = true;
+
+ if (doLength && objType !== 'map' && objType !== 'set') {
+ new Assertion(obj, flagMsg, ssfi, true).to.have.property('length');
+ }
+
+ if (!doLength && (objType === 'date' && nType !== 'date')) {
+ errorMessage = msgPrefix + 'the argument to most must be a date';
+ } else if (nType !== 'number' && (doLength || objType === 'number')) {
+ errorMessage = msgPrefix + 'the argument to most must be a number';
+ } else if (!doLength && (objType !== 'date' && objType !== 'number')) {
+ var printObj = (objType === 'string') ? "'" + obj + "'" : obj;
+ errorMessage = msgPrefix + 'expected ' + printObj + ' to be a number or a date';
+ } else {
+ shouldThrow = false;
+ }
+
+ if (shouldThrow) {
+ throw new AssertionError(errorMessage, undefined, ssfi);
+ }
+
+ if (doLength) {
+ var descriptor = 'length'
+ , itemsCount;
+ if (objType === 'map' || objType === 'set') {
+ descriptor = 'size';
+ itemsCount = obj.size;
+ } else {
+ itemsCount = obj.length;
+ }
+ this.assert(
+ itemsCount <= n
+ , 'expected #{this} to have a ' + descriptor + ' at most #{exp} but got #{act}'
+ , 'expected #{this} to have a ' + descriptor + ' above #{exp}'
+ , n
+ , itemsCount
+ );
+ } else {
+ this.assert(
+ obj <= n
+ , 'expected #{this} to be at most #{exp}'
+ , 'expected #{this} to be above #{exp}'
+ , n
+ );
+ }
+ }
+
+ Assertion.addMethod('most', assertMost);
+ Assertion.addMethod('lte', assertMost);
+
+ /**
+ * ### .within(start, finish[, msg])
+ *
+ * Asserts that the target is a number or a date greater than or equal to the given
+ * number or date `start`, and less than or equal to the given number or date `finish` respectively.
+ * However, it's often best to assert that the target is equal to its expected
+ * value.
+ *
+ * expect(2).to.equal(2); // Recommended
+ * expect(2).to.be.within(1, 3); // Not recommended
+ * expect(2).to.be.within(2, 3); // Not recommended
+ * expect(2).to.be.within(1, 2); // Not recommended
+ *
+ * Add `.lengthOf` earlier in the chain to assert that the target's `length`
+ * or `size` is greater than or equal to the given number `start`, and less
+ * than or equal to the given number `finish`.
+ *
+ * expect('foo').to.have.lengthOf(3); // Recommended
+ * expect('foo').to.have.lengthOf.within(2, 4); // Not recommended
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(3); // Recommended
+ * expect([1, 2, 3]).to.have.lengthOf.within(2, 4); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.within`.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.within(2, 4); // Not recommended
+ *
+ * `.within` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect(4).to.be.within(1, 3, 'nooo why fail??');
+ * expect(4, 'nooo why fail??').to.be.within(1, 3);
+ *
+ * @name within
+ * @param {Number} start lower bound inclusive
+ * @param {Number} finish upper bound inclusive
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addMethod('within', function (start, finish, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , doLength = flag(this, 'doLength')
+ , flagMsg = flag(this, 'message')
+ , msgPrefix = ((flagMsg) ? flagMsg + ': ' : '')
+ , ssfi = flag(this, 'ssfi')
+ , objType = _.type(obj).toLowerCase()
+ , startType = _.type(start).toLowerCase()
+ , finishType = _.type(finish).toLowerCase()
+ , errorMessage
+ , shouldThrow = true
+ , range = (startType === 'date' && finishType === 'date')
+ ? start.toUTCString() + '..' + finish.toUTCString()
+ : start + '..' + finish;
+
+ if (doLength && objType !== 'map' && objType !== 'set') {
+ new Assertion(obj, flagMsg, ssfi, true).to.have.property('length');
+ }
+
+ if (!doLength && (objType === 'date' && (startType !== 'date' || finishType !== 'date'))) {
+ errorMessage = msgPrefix + 'the arguments to within must be dates';
+ } else if ((startType !== 'number' || finishType !== 'number') && (doLength || objType === 'number')) {
+ errorMessage = msgPrefix + 'the arguments to within must be numbers';
+ } else if (!doLength && (objType !== 'date' && objType !== 'number')) {
+ var printObj = (objType === 'string') ? "'" + obj + "'" : obj;
+ errorMessage = msgPrefix + 'expected ' + printObj + ' to be a number or a date';
+ } else {
+ shouldThrow = false;
+ }
+
+ if (shouldThrow) {
+ throw new AssertionError(errorMessage, undefined, ssfi);
+ }
+
+ if (doLength) {
+ var descriptor = 'length'
+ , itemsCount;
+ if (objType === 'map' || objType === 'set') {
+ descriptor = 'size';
+ itemsCount = obj.size;
+ } else {
+ itemsCount = obj.length;
+ }
+ this.assert(
+ itemsCount >= start && itemsCount <= finish
+ , 'expected #{this} to have a ' + descriptor + ' within ' + range
+ , 'expected #{this} to not have a ' + descriptor + ' within ' + range
+ );
+ } else {
+ this.assert(
+ obj >= start && obj <= finish
+ , 'expected #{this} to be within ' + range
+ , 'expected #{this} to not be within ' + range
+ );
+ }
+ });
+
+ /**
+ * ### .instanceof(constructor[, msg])
+ *
+ * Asserts that the target is an instance of the given `constructor`.
+ *
+ * function Cat () { }
+ *
+ * expect(new Cat()).to.be.an.instanceof(Cat);
+ * expect([1, 2]).to.be.an.instanceof(Array);
+ *
+ * Add `.not` earlier in the chain to negate `.instanceof`.
+ *
+ * expect({a: 1}).to.not.be.an.instanceof(Array);
+ *
+ * `.instanceof` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect(1).to.be.an.instanceof(Array, 'nooo why fail??');
+ * expect(1, 'nooo why fail??').to.be.an.instanceof(Array);
+ *
+ * Due to limitations in ES5, `.instanceof` may not always work as expected
+ * when using a transpiler such as Babel or TypeScript. In particular, it may
+ * produce unexpected results when subclassing built-in object such as
+ * `Array`, `Error`, and `Map`. See your transpiler's docs for details:
+ *
+ * - ([Babel](https://babeljs.io/docs/usage/caveats/#classes))
+ * - ([TypeScript](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work))
+ *
+ * The alias `.instanceOf` can be used interchangeably with `.instanceof`.
+ *
+ * @name instanceof
+ * @param {Constructor} constructor
+ * @param {String} msg _optional_
+ * @alias instanceOf
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertInstanceOf (constructor, msg) {
+ if (msg) flag(this, 'message', msg);
+
+ var target = flag(this, 'object')
+ var ssfi = flag(this, 'ssfi');
+ var flagMsg = flag(this, 'message');
+
+ try {
+ var isInstanceOf = target instanceof constructor;
+ } catch (err) {
+ if (err instanceof TypeError) {
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+ throw new AssertionError(
+ flagMsg + 'The instanceof assertion needs a constructor but '
+ + _.type(constructor) + ' was given.',
+ undefined,
+ ssfi
+ );
+ }
+ throw err;
+ }
+
+ var name = _.getName(constructor);
+ if (name === null) {
+ name = 'an unnamed constructor';
+ }
+
+ this.assert(
+ isInstanceOf
+ , 'expected #{this} to be an instance of ' + name
+ , 'expected #{this} to not be an instance of ' + name
+ );
+ };
+
+ Assertion.addMethod('instanceof', assertInstanceOf);
+ Assertion.addMethod('instanceOf', assertInstanceOf);
+
+ /**
+ * ### .property(name[, val[, msg]])
+ *
+ * Asserts that the target has a property with the given key `name`.
+ *
+ * expect({a: 1}).to.have.property('a');
+ *
+ * When `val` is provided, `.property` also asserts that the property's value
+ * is equal to the given `val`.
+ *
+ * expect({a: 1}).to.have.property('a', 1);
+ *
+ * By default, strict (`===`) equality is used. Add `.deep` earlier in the
+ * chain to use deep equality instead. See the `deep-eql` project page for
+ * info on the deep equality algorithm: https://github.com/chaijs/deep-eql.
+ *
+ * // Target object deeply (but not strictly) has property `x: {a: 1}`
+ * expect({x: {a: 1}}).to.have.deep.property('x', {a: 1});
+ * expect({x: {a: 1}}).to.not.have.property('x', {a: 1});
+ *
+ * The target's enumerable and non-enumerable properties are always included
+ * in the search. By default, both own and inherited properties are included.
+ * Add `.own` earlier in the chain to exclude inherited properties from the
+ * search.
+ *
+ * Object.prototype.b = 2;
+ *
+ * expect({a: 1}).to.have.own.property('a');
+ * expect({a: 1}).to.have.own.property('a', 1);
+ * expect({a: 1}).to.have.property('b');
+ * expect({a: 1}).to.not.have.own.property('b');
+ *
+ * `.deep` and `.own` can be combined.
+ *
+ * expect({x: {a: 1}}).to.have.deep.own.property('x', {a: 1});
+ *
+ * Add `.nested` earlier in the chain to enable dot- and bracket-notation when
+ * referencing nested properties.
+ *
+ * expect({a: {b: ['x', 'y']}}).to.have.nested.property('a.b[1]');
+ * expect({a: {b: ['x', 'y']}}).to.have.nested.property('a.b[1]', 'y');
+ *
+ * If `.` or `[]` are part of an actual property name, they can be escaped by
+ * adding two backslashes before them.
+ *
+ * expect({'.a': {'[b]': 'x'}}).to.have.nested.property('\\.a.\\[b\\]');
+ *
+ * `.deep` and `.nested` can be combined.
+ *
+ * expect({a: {b: [{c: 3}]}})
+ * .to.have.deep.nested.property('a.b[0]', {c: 3});
+ *
+ * `.own` and `.nested` cannot be combined.
+ *
+ * Add `.not` earlier in the chain to negate `.property`.
+ *
+ * expect({a: 1}).to.not.have.property('b');
+ *
+ * However, it's dangerous to negate `.property` when providing `val`. The
+ * problem is that it creates uncertain expectations by asserting that the
+ * target either doesn't have a property with the given key `name`, or that it
+ * does have a property with the given key `name` but its value isn't equal to
+ * the given `val`. It's often best to identify the exact output that's
+ * expected, and then write an assertion that only accepts that exact output.
+ *
+ * When the target isn't expected to have a property with the given key
+ * `name`, it's often best to assert exactly that.
+ *
+ * expect({b: 2}).to.not.have.property('a'); // Recommended
+ * expect({b: 2}).to.not.have.property('a', 1); // Not recommended
+ *
+ * When the target is expected to have a property with the given key `name`,
+ * it's often best to assert that the property has its expected value, rather
+ * than asserting that it doesn't have one of many unexpected values.
+ *
+ * expect({a: 3}).to.have.property('a', 3); // Recommended
+ * expect({a: 3}).to.not.have.property('a', 1); // Not recommended
+ *
+ * `.property` changes the target of any assertions that follow in the chain
+ * to be the value of the property from the original target object.
+ *
+ * expect({a: 1}).to.have.property('a').that.is.a('number');
+ *
+ * `.property` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`. When not providing `val`, only use the
+ * second form.
+ *
+ * // Recommended
+ * expect({a: 1}).to.have.property('a', 2, 'nooo why fail??');
+ * expect({a: 1}, 'nooo why fail??').to.have.property('a', 2);
+ * expect({a: 1}, 'nooo why fail??').to.have.property('b');
+ *
+ * // Not recommended
+ * expect({a: 1}).to.have.property('b', undefined, 'nooo why fail??');
+ *
+ * The above assertion isn't the same thing as not providing `val`. Instead,
+ * it's asserting that the target object has a `b` property that's equal to
+ * `undefined`.
+ *
+ * The assertions `.ownProperty` and `.haveOwnProperty` can be used
+ * interchangeably with `.own.property`.
+ *
+ * @name property
+ * @param {String} name
+ * @param {Mixed} val (optional)
+ * @param {String} msg _optional_
+ * @returns value of property for chaining
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertProperty (name, val, msg) {
+ if (msg) flag(this, 'message', msg);
+
+ var isNested = flag(this, 'nested')
+ , isOwn = flag(this, 'own')
+ , flagMsg = flag(this, 'message')
+ , obj = flag(this, 'object')
+ , ssfi = flag(this, 'ssfi')
+ , nameType = typeof name;
+
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+
+ if (isNested) {
+ if (nameType !== 'string') {
+ throw new AssertionError(
+ flagMsg + 'the argument to property must be a string when using nested syntax',
+ undefined,
+ ssfi
+ );
+ }
+ } else {
+ if (nameType !== 'string' && nameType !== 'number' && nameType !== 'symbol') {
+ throw new AssertionError(
+ flagMsg + 'the argument to property must be a string, number, or symbol',
+ undefined,
+ ssfi
+ );
+ }
+ }
+
+ if (isNested && isOwn) {
+ throw new AssertionError(
+ flagMsg + 'The "nested" and "own" flags cannot be combined.',
+ undefined,
+ ssfi
+ );
+ }
+
+ if (obj === null || obj === undefined) {
+ throw new AssertionError(
+ flagMsg + 'Target cannot be null or undefined.',
+ undefined,
+ ssfi
+ );
+ }
+
+ var isDeep = flag(this, 'deep')
+ , negate = flag(this, 'negate')
+ , pathInfo = isNested ? _.getPathInfo(obj, name) : null
+ , value = isNested ? pathInfo.value : obj[name];
+
+ var descriptor = '';
+ if (isDeep) descriptor += 'deep ';
+ if (isOwn) descriptor += 'own ';
+ if (isNested) descriptor += 'nested ';
+ descriptor += 'property ';
+
+ var hasProperty;
+ if (isOwn) hasProperty = Object.prototype.hasOwnProperty.call(obj, name);
+ else if (isNested) hasProperty = pathInfo.exists;
+ else hasProperty = _.hasProperty(obj, name);
+
+ // When performing a negated assertion for both name and val, merely having
+ // a property with the given name isn't enough to cause the assertion to
+ // fail. It must both have a property with the given name, and the value of
+ // that property must equal the given val. Therefore, skip this assertion in
+ // favor of the next.
+ if (!negate || arguments.length === 1) {
+ this.assert(
+ hasProperty
+ , 'expected #{this} to have ' + descriptor + _.inspect(name)
+ , 'expected #{this} to not have ' + descriptor + _.inspect(name));
+ }
+
+ if (arguments.length > 1) {
+ this.assert(
+ hasProperty && (isDeep ? _.eql(val, value) : val === value)
+ , 'expected #{this} to have ' + descriptor + _.inspect(name) + ' of #{exp}, but got #{act}'
+ , 'expected #{this} to not have ' + descriptor + _.inspect(name) + ' of #{act}'
+ , val
+ , value
+ );
+ }
+
+ flag(this, 'object', value);
+ }
+
+ Assertion.addMethod('property', assertProperty);
+
+ function assertOwnProperty (name, value, msg) {
+ flag(this, 'own', true);
+ assertProperty.apply(this, arguments);
+ }
+
+ Assertion.addMethod('ownProperty', assertOwnProperty);
+ Assertion.addMethod('haveOwnProperty', assertOwnProperty);
+
+ /**
+ * ### .ownPropertyDescriptor(name[, descriptor[, msg]])
+ *
+ * Asserts that the target has its own property descriptor with the given key
+ * `name`. Enumerable and non-enumerable properties are included in the
+ * search.
+ *
+ * expect({a: 1}).to.have.ownPropertyDescriptor('a');
+ *
+ * When `descriptor` is provided, `.ownPropertyDescriptor` also asserts that
+ * the property's descriptor is deeply equal to the given `descriptor`. See
+ * the `deep-eql` project page for info on the deep equality algorithm:
+ * https://github.com/chaijs/deep-eql.
+ *
+ * expect({a: 1}).to.have.ownPropertyDescriptor('a', {
+ * configurable: true,
+ * enumerable: true,
+ * writable: true,
+ * value: 1,
+ * });
+ *
+ * Add `.not` earlier in the chain to negate `.ownPropertyDescriptor`.
+ *
+ * expect({a: 1}).to.not.have.ownPropertyDescriptor('b');
+ *
+ * However, it's dangerous to negate `.ownPropertyDescriptor` when providing
+ * a `descriptor`. The problem is that it creates uncertain expectations by
+ * asserting that the target either doesn't have a property descriptor with
+ * the given key `name`, or that it does have a property descriptor with the
+ * given key `name` but its not deeply equal to the given `descriptor`. It's
+ * often best to identify the exact output that's expected, and then write an
+ * assertion that only accepts that exact output.
+ *
+ * When the target isn't expected to have a property descriptor with the given
+ * key `name`, it's often best to assert exactly that.
+ *
+ * // Recommended
+ * expect({b: 2}).to.not.have.ownPropertyDescriptor('a');
+ *
+ * // Not recommended
+ * expect({b: 2}).to.not.have.ownPropertyDescriptor('a', {
+ * configurable: true,
+ * enumerable: true,
+ * writable: true,
+ * value: 1,
+ * });
+ *
+ * When the target is expected to have a property descriptor with the given
+ * key `name`, it's often best to assert that the property has its expected
+ * descriptor, rather than asserting that it doesn't have one of many
+ * unexpected descriptors.
+ *
+ * // Recommended
+ * expect({a: 3}).to.have.ownPropertyDescriptor('a', {
+ * configurable: true,
+ * enumerable: true,
+ * writable: true,
+ * value: 3,
+ * });
+ *
+ * // Not recommended
+ * expect({a: 3}).to.not.have.ownPropertyDescriptor('a', {
+ * configurable: true,
+ * enumerable: true,
+ * writable: true,
+ * value: 1,
+ * });
+ *
+ * `.ownPropertyDescriptor` changes the target of any assertions that follow
+ * in the chain to be the value of the property descriptor from the original
+ * target object.
+ *
+ * expect({a: 1}).to.have.ownPropertyDescriptor('a')
+ * .that.has.property('enumerable', true);
+ *
+ * `.ownPropertyDescriptor` accepts an optional `msg` argument which is a
+ * custom error message to show when the assertion fails. The message can also
+ * be given as the second argument to `expect`. When not providing
+ * `descriptor`, only use the second form.
+ *
+ * // Recommended
+ * expect({a: 1}).to.have.ownPropertyDescriptor('a', {
+ * configurable: true,
+ * enumerable: true,
+ * writable: true,
+ * value: 2,
+ * }, 'nooo why fail??');
+ *
+ * // Recommended
+ * expect({a: 1}, 'nooo why fail??').to.have.ownPropertyDescriptor('a', {
+ * configurable: true,
+ * enumerable: true,
+ * writable: true,
+ * value: 2,
+ * });
+ *
+ * // Recommended
+ * expect({a: 1}, 'nooo why fail??').to.have.ownPropertyDescriptor('b');
+ *
+ * // Not recommended
+ * expect({a: 1})
+ * .to.have.ownPropertyDescriptor('b', undefined, 'nooo why fail??');
+ *
+ * The above assertion isn't the same thing as not providing `descriptor`.
+ * Instead, it's asserting that the target object has a `b` property
+ * descriptor that's deeply equal to `undefined`.
+ *
+ * The alias `.haveOwnPropertyDescriptor` can be used interchangeably with
+ * `.ownPropertyDescriptor`.
+ *
+ * @name ownPropertyDescriptor
+ * @alias haveOwnPropertyDescriptor
+ * @param {String} name
+ * @param {Object} descriptor _optional_
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertOwnPropertyDescriptor (name, descriptor, msg) {
+ if (typeof descriptor === 'string') {
+ msg = descriptor;
+ descriptor = null;
+ }
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object');
+ var actualDescriptor = Object.getOwnPropertyDescriptor(Object(obj), name);
+ if (actualDescriptor && descriptor) {
+ this.assert(
+ _.eql(descriptor, actualDescriptor)
+ , 'expected the own property descriptor for ' + _.inspect(name) + ' on #{this} to match ' + _.inspect(descriptor) + ', got ' + _.inspect(actualDescriptor)
+ , 'expected the own property descriptor for ' + _.inspect(name) + ' on #{this} to not match ' + _.inspect(descriptor)
+ , descriptor
+ , actualDescriptor
+ , true
+ );
+ } else {
+ this.assert(
+ actualDescriptor
+ , 'expected #{this} to have an own property descriptor for ' + _.inspect(name)
+ , 'expected #{this} to not have an own property descriptor for ' + _.inspect(name)
+ );
+ }
+ flag(this, 'object', actualDescriptor);
+ }
+
+ Assertion.addMethod('ownPropertyDescriptor', assertOwnPropertyDescriptor);
+ Assertion.addMethod('haveOwnPropertyDescriptor', assertOwnPropertyDescriptor);
+
+ /**
+ * ### .lengthOf(n[, msg])
+ *
+ * Asserts that the target's `length` or `size` is equal to the given number
+ * `n`.
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(3);
+ * expect('foo').to.have.lengthOf(3);
+ * expect(new Set([1, 2, 3])).to.have.lengthOf(3);
+ * expect(new Map([['a', 1], ['b', 2], ['c', 3]])).to.have.lengthOf(3);
+ *
+ * Add `.not` earlier in the chain to negate `.lengthOf`. However, it's often
+ * best to assert that the target's `length` property is equal to its expected
+ * value, rather than not equal to one of many unexpected values.
+ *
+ * expect('foo').to.have.lengthOf(3); // Recommended
+ * expect('foo').to.not.have.lengthOf(4); // Not recommended
+ *
+ * `.lengthOf` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect([1, 2, 3]).to.have.lengthOf(2, 'nooo why fail??');
+ * expect([1, 2, 3], 'nooo why fail??').to.have.lengthOf(2);
+ *
+ * `.lengthOf` can also be used as a language chain, causing all `.above`,
+ * `.below`, `.least`, `.most`, and `.within` assertions that follow in the
+ * chain to use the target's `length` property as the target. However, it's
+ * often best to assert that the target's `length` property is equal to its
+ * expected length, rather than asserting that its `length` property falls
+ * within some range of values.
+ *
+ * // Recommended
+ * expect([1, 2, 3]).to.have.lengthOf(3);
+ *
+ * // Not recommended
+ * expect([1, 2, 3]).to.have.lengthOf.above(2);
+ * expect([1, 2, 3]).to.have.lengthOf.below(4);
+ * expect([1, 2, 3]).to.have.lengthOf.at.least(3);
+ * expect([1, 2, 3]).to.have.lengthOf.at.most(3);
+ * expect([1, 2, 3]).to.have.lengthOf.within(2,4);
+ *
+ * Due to a compatibility issue, the alias `.length` can't be chained directly
+ * off of an uninvoked method such as `.a`. Therefore, `.length` can't be used
+ * interchangeably with `.lengthOf` in every situation. It's recommended to
+ * always use `.lengthOf` instead of `.length`.
+ *
+ * expect([1, 2, 3]).to.have.a.length(3); // incompatible; throws error
+ * expect([1, 2, 3]).to.have.a.lengthOf(3); // passes as expected
+ *
+ * @name lengthOf
+ * @alias length
+ * @param {Number} n
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertLengthChain () {
+ flag(this, 'doLength', true);
+ }
+
+ function assertLength (n, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , objType = _.type(obj).toLowerCase()
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi')
+ , descriptor = 'length'
+ , itemsCount;
+
+ switch (objType) {
+ case 'map':
+ case 'set':
+ descriptor = 'size';
+ itemsCount = obj.size;
+ break;
+ default:
+ new Assertion(obj, flagMsg, ssfi, true).to.have.property('length');
+ itemsCount = obj.length;
+ }
+
+ this.assert(
+ itemsCount == n
+ , 'expected #{this} to have a ' + descriptor + ' of #{exp} but got #{act}'
+ , 'expected #{this} to not have a ' + descriptor + ' of #{act}'
+ , n
+ , itemsCount
+ );
+ }
+
+ Assertion.addChainableMethod('length', assertLength, assertLengthChain);
+ Assertion.addChainableMethod('lengthOf', assertLength, assertLengthChain);
+
+ /**
+ * ### .match(re[, msg])
+ *
+ * Asserts that the target matches the given regular expression `re`.
+ *
+ * expect('foobar').to.match(/^foo/);
+ *
+ * Add `.not` earlier in the chain to negate `.match`.
+ *
+ * expect('foobar').to.not.match(/taco/);
+ *
+ * `.match` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect('foobar').to.match(/taco/, 'nooo why fail??');
+ * expect('foobar', 'nooo why fail??').to.match(/taco/);
+ *
+ * The alias `.matches` can be used interchangeably with `.match`.
+ *
+ * @name match
+ * @alias matches
+ * @param {RegExp} re
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+ function assertMatch(re, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object');
+ this.assert(
+ re.exec(obj)
+ , 'expected #{this} to match ' + re
+ , 'expected #{this} not to match ' + re
+ );
+ }
+
+ Assertion.addMethod('match', assertMatch);
+ Assertion.addMethod('matches', assertMatch);
+
+ /**
+ * ### .string(str[, msg])
+ *
+ * Asserts that the target string contains the given substring `str`.
+ *
+ * expect('foobar').to.have.string('bar');
+ *
+ * Add `.not` earlier in the chain to negate `.string`.
+ *
+ * expect('foobar').to.not.have.string('taco');
+ *
+ * `.string` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect('foobar').to.have.string('taco', 'nooo why fail??');
+ * expect('foobar', 'nooo why fail??').to.have.string('taco');
+ *
+ * @name string
+ * @param {String} str
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addMethod('string', function (str, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+ new Assertion(obj, flagMsg, ssfi, true).is.a('string');
+
+ this.assert(
+ ~obj.indexOf(str)
+ , 'expected #{this} to contain ' + _.inspect(str)
+ , 'expected #{this} to not contain ' + _.inspect(str)
+ );
+ });
+
+ /**
+ * ### .keys(key1[, key2[, ...]])
+ *
+ * Asserts that the target object, array, map, or set has the given keys. Only
+ * the target's own inherited properties are included in the search.
+ *
+ * When the target is an object or array, keys can be provided as one or more
+ * string arguments, a single array argument, or a single object argument. In
+ * the latter case, only the keys in the given object matter; the values are
+ * ignored.
+ *
+ * expect({a: 1, b: 2}).to.have.all.keys('a', 'b');
+ * expect(['x', 'y']).to.have.all.keys(0, 1);
+ *
+ * expect({a: 1, b: 2}).to.have.all.keys(['a', 'b']);
+ * expect(['x', 'y']).to.have.all.keys([0, 1]);
+ *
+ * expect({a: 1, b: 2}).to.have.all.keys({a: 4, b: 5}); // ignore 4 and 5
+ * expect(['x', 'y']).to.have.all.keys({0: 4, 1: 5}); // ignore 4 and 5
+ *
+ * When the target is a map or set, each key must be provided as a separate
+ * argument.
+ *
+ * expect(new Map([['a', 1], ['b', 2]])).to.have.all.keys('a', 'b');
+ * expect(new Set(['a', 'b'])).to.have.all.keys('a', 'b');
+ *
+ * Because `.keys` does different things based on the target's type, it's
+ * important to check the target's type before using `.keys`. See the `.a` doc
+ * for info on testing a target's type.
+ *
+ * expect({a: 1, b: 2}).to.be.an('object').that.has.all.keys('a', 'b');
+ *
+ * By default, strict (`===`) equality is used to compare keys of maps and
+ * sets. Add `.deep` earlier in the chain to use deep equality instead. See
+ * the `deep-eql` project page for info on the deep equality algorithm:
+ * https://github.com/chaijs/deep-eql.
+ *
+ * // Target set deeply (but not strictly) has key `{a: 1}`
+ * expect(new Set([{a: 1}])).to.have.all.deep.keys([{a: 1}]);
+ * expect(new Set([{a: 1}])).to.not.have.all.keys([{a: 1}]);
+ *
+ * By default, the target must have all of the given keys and no more. Add
+ * `.any` earlier in the chain to only require that the target have at least
+ * one of the given keys. Also, add `.not` earlier in the chain to negate
+ * `.keys`. It's often best to add `.any` when negating `.keys`, and to use
+ * `.all` when asserting `.keys` without negation.
+ *
+ * When negating `.keys`, `.any` is preferred because `.not.any.keys` asserts
+ * exactly what's expected of the output, whereas `.not.all.keys` creates
+ * uncertain expectations.
+ *
+ * // Recommended; asserts that target doesn't have any of the given keys
+ * expect({a: 1, b: 2}).to.not.have.any.keys('c', 'd');
+ *
+ * // Not recommended; asserts that target doesn't have all of the given
+ * // keys but may or may not have some of them
+ * expect({a: 1, b: 2}).to.not.have.all.keys('c', 'd');
+ *
+ * When asserting `.keys` without negation, `.all` is preferred because
+ * `.all.keys` asserts exactly what's expected of the output, whereas
+ * `.any.keys` creates uncertain expectations.
+ *
+ * // Recommended; asserts that target has all the given keys
+ * expect({a: 1, b: 2}).to.have.all.keys('a', 'b');
+ *
+ * // Not recommended; asserts that target has at least one of the given
+ * // keys but may or may not have more of them
+ * expect({a: 1, b: 2}).to.have.any.keys('a', 'b');
+ *
+ * Note that `.all` is used by default when neither `.all` nor `.any` appear
+ * earlier in the chain. However, it's often best to add `.all` anyway because
+ * it improves readability.
+ *
+ * // Both assertions are identical
+ * expect({a: 1, b: 2}).to.have.all.keys('a', 'b'); // Recommended
+ * expect({a: 1, b: 2}).to.have.keys('a', 'b'); // Not recommended
+ *
+ * Add `.include` earlier in the chain to require that the target's keys be a
+ * superset of the expected keys, rather than identical sets.
+ *
+ * // Target object's keys are a superset of ['a', 'b'] but not identical
+ * expect({a: 1, b: 2, c: 3}).to.include.all.keys('a', 'b');
+ * expect({a: 1, b: 2, c: 3}).to.not.have.all.keys('a', 'b');
+ *
+ * However, if `.any` and `.include` are combined, only the `.any` takes
+ * effect. The `.include` is ignored in this case.
+ *
+ * // Both assertions are identical
+ * expect({a: 1}).to.have.any.keys('a', 'b');
+ * expect({a: 1}).to.include.any.keys('a', 'b');
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect({a: 1}, 'nooo why fail??').to.have.key('b');
+ *
+ * The alias `.key` can be used interchangeably with `.keys`.
+ *
+ * @name keys
+ * @alias key
+ * @param {...String|Array|Object} keys
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertKeys (keys) {
+ var obj = flag(this, 'object')
+ , objType = _.type(obj)
+ , keysType = _.type(keys)
+ , ssfi = flag(this, 'ssfi')
+ , isDeep = flag(this, 'deep')
+ , str
+ , deepStr = ''
+ , actual
+ , ok = true
+ , flagMsg = flag(this, 'message');
+
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+ var mixedArgsMsg = flagMsg + 'when testing keys against an object or an array you must give a single Array|Object|String argument or multiple String arguments';
+
+ if (objType === 'Map' || objType === 'Set') {
+ deepStr = isDeep ? 'deeply ' : '';
+ actual = [];
+
+ // Map and Set '.keys' aren't supported in IE 11. Therefore, use .forEach.
+ obj.forEach(function (val, key) { actual.push(key) });
+
+ if (keysType !== 'Array') {
+ keys = Array.prototype.slice.call(arguments);
+ }
+ } else {
+ actual = _.getOwnEnumerableProperties(obj);
+
+ switch (keysType) {
+ case 'Array':
+ if (arguments.length > 1) {
+ throw new AssertionError(mixedArgsMsg, undefined, ssfi);
+ }
+ break;
+ case 'Object':
+ if (arguments.length > 1) {
+ throw new AssertionError(mixedArgsMsg, undefined, ssfi);
+ }
+ keys = Object.keys(keys);
+ break;
+ default:
+ keys = Array.prototype.slice.call(arguments);
+ }
+
+ // Only stringify non-Symbols because Symbols would become "Symbol()"
+ keys = keys.map(function (val) {
+ return typeof val === 'symbol' ? val : String(val);
+ });
+ }
+
+ if (!keys.length) {
+ throw new AssertionError(flagMsg + 'keys required', undefined, ssfi);
+ }
+
+ var len = keys.length
+ , any = flag(this, 'any')
+ , all = flag(this, 'all')
+ , expected = keys;
+
+ if (!any && !all) {
+ all = true;
+ }
+
+ // Has any
+ if (any) {
+ ok = expected.some(function(expectedKey) {
+ return actual.some(function(actualKey) {
+ if (isDeep) {
+ return _.eql(expectedKey, actualKey);
+ } else {
+ return expectedKey === actualKey;
+ }
+ });
+ });
+ }
+
+ // Has all
+ if (all) {
+ ok = expected.every(function(expectedKey) {
+ return actual.some(function(actualKey) {
+ if (isDeep) {
+ return _.eql(expectedKey, actualKey);
+ } else {
+ return expectedKey === actualKey;
+ }
+ });
+ });
+
+ if (!flag(this, 'contains')) {
+ ok = ok && keys.length == actual.length;
+ }
+ }
+
+ // Key string
+ if (len > 1) {
+ keys = keys.map(function(key) {
+ return _.inspect(key);
+ });
+ var last = keys.pop();
+ if (all) {
+ str = keys.join(', ') + ', and ' + last;
+ }
+ if (any) {
+ str = keys.join(', ') + ', or ' + last;
+ }
+ } else {
+ str = _.inspect(keys[0]);
+ }
+
+ // Form
+ str = (len > 1 ? 'keys ' : 'key ') + str;
+
+ // Have / include
+ str = (flag(this, 'contains') ? 'contain ' : 'have ') + str;
+
+ // Assertion
+ this.assert(
+ ok
+ , 'expected #{this} to ' + deepStr + str
+ , 'expected #{this} to not ' + deepStr + str
+ , expected.slice(0).sort(_.compareByInspect)
+ , actual.sort(_.compareByInspect)
+ , true
+ );
+ }
+
+ Assertion.addMethod('keys', assertKeys);
+ Assertion.addMethod('key', assertKeys);
+
+ /**
+ * ### .throw([errorLike], [errMsgMatcher], [msg])
+ *
+ * When no arguments are provided, `.throw` invokes the target function and
+ * asserts that an error is thrown.
+ *
+ * var badFn = function () { throw new TypeError('Illegal salmon!'); };
+ *
+ * expect(badFn).to.throw();
+ *
+ * When one argument is provided, and it's an error constructor, `.throw`
+ * invokes the target function and asserts that an error is thrown that's an
+ * instance of that error constructor.
+ *
+ * var badFn = function () { throw new TypeError('Illegal salmon!'); };
+ *
+ * expect(badFn).to.throw(TypeError);
+ *
+ * When one argument is provided, and it's an error instance, `.throw` invokes
+ * the target function and asserts that an error is thrown that's strictly
+ * (`===`) equal to that error instance.
+ *
+ * var err = new TypeError('Illegal salmon!');
+ * var badFn = function () { throw err; };
+ *
+ * expect(badFn).to.throw(err);
+ *
+ * When one argument is provided, and it's a string, `.throw` invokes the
+ * target function and asserts that an error is thrown with a message that
+ * contains that string.
+ *
+ * var badFn = function () { throw new TypeError('Illegal salmon!'); };
+ *
+ * expect(badFn).to.throw('salmon');
+ *
+ * When one argument is provided, and it's a regular expression, `.throw`
+ * invokes the target function and asserts that an error is thrown with a
+ * message that matches that regular expression.
+ *
+ * var badFn = function () { throw new TypeError('Illegal salmon!'); };
+ *
+ * expect(badFn).to.throw(/salmon/);
+ *
+ * When two arguments are provided, and the first is an error instance or
+ * constructor, and the second is a string or regular expression, `.throw`
+ * invokes the function and asserts that an error is thrown that fulfills both
+ * conditions as described above.
+ *
+ * var err = new TypeError('Illegal salmon!');
+ * var badFn = function () { throw err; };
+ *
+ * expect(badFn).to.throw(TypeError, 'salmon');
+ * expect(badFn).to.throw(TypeError, /salmon/);
+ * expect(badFn).to.throw(err, 'salmon');
+ * expect(badFn).to.throw(err, /salmon/);
+ *
+ * Add `.not` earlier in the chain to negate `.throw`.
+ *
+ * var goodFn = function () {};
+ *
+ * expect(goodFn).to.not.throw();
+ *
+ * However, it's dangerous to negate `.throw` when providing any arguments.
+ * The problem is that it creates uncertain expectations by asserting that the
+ * target either doesn't throw an error, or that it throws an error but of a
+ * different type than the given type, or that it throws an error of the given
+ * type but with a message that doesn't include the given string. It's often
+ * best to identify the exact output that's expected, and then write an
+ * assertion that only accepts that exact output.
+ *
+ * When the target isn't expected to throw an error, it's often best to assert
+ * exactly that.
+ *
+ * var goodFn = function () {};
+ *
+ * expect(goodFn).to.not.throw(); // Recommended
+ * expect(goodFn).to.not.throw(ReferenceError, 'x'); // Not recommended
+ *
+ * When the target is expected to throw an error, it's often best to assert
+ * that the error is of its expected type, and has a message that includes an
+ * expected string, rather than asserting that it doesn't have one of many
+ * unexpected types, and doesn't have a message that includes some string.
+ *
+ * var badFn = function () { throw new TypeError('Illegal salmon!'); };
+ *
+ * expect(badFn).to.throw(TypeError, 'salmon'); // Recommended
+ * expect(badFn).to.not.throw(ReferenceError, 'x'); // Not recommended
+ *
+ * `.throw` changes the target of any assertions that follow in the chain to
+ * be the error object that's thrown.
+ *
+ * var err = new TypeError('Illegal salmon!');
+ * err.code = 42;
+ * var badFn = function () { throw err; };
+ *
+ * expect(badFn).to.throw(TypeError).with.property('code', 42);
+ *
+ * `.throw` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`. When not providing two arguments, always use
+ * the second form.
+ *
+ * var goodFn = function () {};
+ *
+ * expect(goodFn).to.throw(TypeError, 'x', 'nooo why fail??');
+ * expect(goodFn, 'nooo why fail??').to.throw();
+ *
+ * Due to limitations in ES5, `.throw` may not always work as expected when
+ * using a transpiler such as Babel or TypeScript. In particular, it may
+ * produce unexpected results when subclassing the built-in `Error` object and
+ * then passing the subclassed constructor to `.throw`. See your transpiler's
+ * docs for details:
+ *
+ * - ([Babel](https://babeljs.io/docs/usage/caveats/#classes))
+ * - ([TypeScript](https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work))
+ *
+ * Beware of some common mistakes when using the `throw` assertion. One common
+ * mistake is to accidentally invoke the function yourself instead of letting
+ * the `throw` assertion invoke the function for you. For example, when
+ * testing if a function named `fn` throws, provide `fn` instead of `fn()` as
+ * the target for the assertion.
+ *
+ * expect(fn).to.throw(); // Good! Tests `fn` as desired
+ * expect(fn()).to.throw(); // Bad! Tests result of `fn()`, not `fn`
+ *
+ * If you need to assert that your function `fn` throws when passed certain
+ * arguments, then wrap a call to `fn` inside of another function.
+ *
+ * expect(function () { fn(42); }).to.throw(); // Function expression
+ * expect(() => fn(42)).to.throw(); // ES6 arrow function
+ *
+ * Another common mistake is to provide an object method (or any stand-alone
+ * function that relies on `this`) as the target of the assertion. Doing so is
+ * problematic because the `this` context will be lost when the function is
+ * invoked by `.throw`; there's no way for it to know what `this` is supposed
+ * to be. There are two ways around this problem. One solution is to wrap the
+ * method or function call inside of another function. Another solution is to
+ * use `bind`.
+ *
+ * expect(function () { cat.meow(); }).to.throw(); // Function expression
+ * expect(() => cat.meow()).to.throw(); // ES6 arrow function
+ * expect(cat.meow.bind(cat)).to.throw(); // Bind
+ *
+ * Finally, it's worth mentioning that it's a best practice in JavaScript to
+ * only throw `Error` and derivatives of `Error` such as `ReferenceError`,
+ * `TypeError`, and user-defined objects that extend `Error`. No other type of
+ * value will generate a stack trace when initialized. With that said, the
+ * `throw` assertion does technically support any type of value being thrown,
+ * not just `Error` and its derivatives.
+ *
+ * The aliases `.throws` and `.Throw` can be used interchangeably with
+ * `.throw`.
+ *
+ * @name throw
+ * @alias throws
+ * @alias Throw
+ * @param {Error|ErrorConstructor} errorLike
+ * @param {String|RegExp} errMsgMatcher error message
+ * @param {String} msg _optional_
+ * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+ * @returns error for chaining (null if no error)
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertThrows (errorLike, errMsgMatcher, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , ssfi = flag(this, 'ssfi')
+ , flagMsg = flag(this, 'message')
+ , negate = flag(this, 'negate') || false;
+ new Assertion(obj, flagMsg, ssfi, true).is.a('function');
+
+ if (errorLike instanceof RegExp || typeof errorLike === 'string') {
+ errMsgMatcher = errorLike;
+ errorLike = null;
+ }
+
+ var caughtErr;
+ try {
+ obj();
+ } catch (err) {
+ caughtErr = err;
+ }
+
+ // If we have the negate flag enabled and at least one valid argument it means we do expect an error
+ // but we want it to match a given set of criteria
+ var everyArgIsUndefined = errorLike === undefined && errMsgMatcher === undefined;
+
+ // If we've got the negate flag enabled and both args, we should only fail if both aren't compatible
+ // See Issue #551 and PR #683@GitHub
+ var everyArgIsDefined = Boolean(errorLike && errMsgMatcher);
+ var errorLikeFail = false;
+ var errMsgMatcherFail = false;
+
+ // Checking if error was thrown
+ if (everyArgIsUndefined || !everyArgIsUndefined && !negate) {
+ // We need this to display results correctly according to their types
+ var errorLikeString = 'an error';
+ if (errorLike instanceof Error) {
+ errorLikeString = '#{exp}';
+ } else if (errorLike) {
+ errorLikeString = _.checkError.getConstructorName(errorLike);
+ }
+
+ this.assert(
+ caughtErr
+ , 'expected #{this} to throw ' + errorLikeString
+ , 'expected #{this} to not throw an error but #{act} was thrown'
+ , errorLike && errorLike.toString()
+ , (caughtErr instanceof Error ?
+ caughtErr.toString() : (typeof caughtErr === 'string' ? caughtErr : caughtErr &&
+ _.checkError.getConstructorName(caughtErr)))
+ );
+ }
+
+ if (errorLike && caughtErr) {
+ // We should compare instances only if `errorLike` is an instance of `Error`
+ if (errorLike instanceof Error) {
+ var isCompatibleInstance = _.checkError.compatibleInstance(caughtErr, errorLike);
+
+ if (isCompatibleInstance === negate) {
+ // These checks were created to ensure we won't fail too soon when we've got both args and a negate
+ // See Issue #551 and PR #683@GitHub
+ if (everyArgIsDefined && negate) {
+ errorLikeFail = true;
+ } else {
+ this.assert(
+ negate
+ , 'expected #{this} to throw #{exp} but #{act} was thrown'
+ , 'expected #{this} to not throw #{exp}' + (caughtErr && !negate ? ' but #{act} was thrown' : '')
+ , errorLike.toString()
+ , caughtErr.toString()
+ );
+ }
+ }
+ }
+
+ var isCompatibleConstructor = _.checkError.compatibleConstructor(caughtErr, errorLike);
+ if (isCompatibleConstructor === negate) {
+ if (everyArgIsDefined && negate) {
+ errorLikeFail = true;
+ } else {
+ this.assert(
+ negate
+ , 'expected #{this} to throw #{exp} but #{act} was thrown'
+ , 'expected #{this} to not throw #{exp}' + (caughtErr ? ' but #{act} was thrown' : '')
+ , (errorLike instanceof Error ? errorLike.toString() : errorLike && _.checkError.getConstructorName(errorLike))
+ , (caughtErr instanceof Error ? caughtErr.toString() : caughtErr && _.checkError.getConstructorName(caughtErr))
+ );
+ }
+ }
+ }
+
+ if (caughtErr && errMsgMatcher !== undefined && errMsgMatcher !== null) {
+ // Here we check compatible messages
+ var placeholder = 'including';
+ if (errMsgMatcher instanceof RegExp) {
+ placeholder = 'matching'
+ }
+
+ var isCompatibleMessage = _.checkError.compatibleMessage(caughtErr, errMsgMatcher);
+ if (isCompatibleMessage === negate) {
+ if (everyArgIsDefined && negate) {
+ errMsgMatcherFail = true;
+ } else {
+ this.assert(
+ negate
+ , 'expected #{this} to throw error ' + placeholder + ' #{exp} but got #{act}'
+ , 'expected #{this} to throw error not ' + placeholder + ' #{exp}'
+ , errMsgMatcher
+ , _.checkError.getMessage(caughtErr)
+ );
+ }
+ }
+ }
+
+ // If both assertions failed and both should've matched we throw an error
+ if (errorLikeFail && errMsgMatcherFail) {
+ this.assert(
+ negate
+ , 'expected #{this} to throw #{exp} but #{act} was thrown'
+ , 'expected #{this} to not throw #{exp}' + (caughtErr ? ' but #{act} was thrown' : '')
+ , (errorLike instanceof Error ? errorLike.toString() : errorLike && _.checkError.getConstructorName(errorLike))
+ , (caughtErr instanceof Error ? caughtErr.toString() : caughtErr && _.checkError.getConstructorName(caughtErr))
+ );
+ }
+
+ flag(this, 'object', caughtErr);
+ };
+
+ Assertion.addMethod('throw', assertThrows);
+ Assertion.addMethod('throws', assertThrows);
+ Assertion.addMethod('Throw', assertThrows);
+
+ /**
+ * ### .respondTo(method[, msg])
+ *
+ * When the target is a non-function object, `.respondTo` asserts that the
+ * target has a method with the given name `method`. The method can be own or
+ * inherited, and it can be enumerable or non-enumerable.
+ *
+ * function Cat () {}
+ * Cat.prototype.meow = function () {};
+ *
+ * expect(new Cat()).to.respondTo('meow');
+ *
+ * When the target is a function, `.respondTo` asserts that the target's
+ * `prototype` property has a method with the given name `method`. Again, the
+ * method can be own or inherited, and it can be enumerable or non-enumerable.
+ *
+ * function Cat () {}
+ * Cat.prototype.meow = function () {};
+ *
+ * expect(Cat).to.respondTo('meow');
+ *
+ * Add `.itself` earlier in the chain to force `.respondTo` to treat the
+ * target as a non-function object, even if it's a function. Thus, it asserts
+ * that the target has a method with the given name `method`, rather than
+ * asserting that the target's `prototype` property has a method with the
+ * given name `method`.
+ *
+ * function Cat () {}
+ * Cat.prototype.meow = function () {};
+ * Cat.hiss = function () {};
+ *
+ * expect(Cat).itself.to.respondTo('hiss').but.not.respondTo('meow');
+ *
+ * When not adding `.itself`, it's important to check the target's type before
+ * using `.respondTo`. See the `.a` doc for info on checking a target's type.
+ *
+ * function Cat () {}
+ * Cat.prototype.meow = function () {};
+ *
+ * expect(new Cat()).to.be.an('object').that.respondsTo('meow');
+ *
+ * Add `.not` earlier in the chain to negate `.respondTo`.
+ *
+ * function Dog () {}
+ * Dog.prototype.bark = function () {};
+ *
+ * expect(new Dog()).to.not.respondTo('meow');
+ *
+ * `.respondTo` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect({}).to.respondTo('meow', 'nooo why fail??');
+ * expect({}, 'nooo why fail??').to.respondTo('meow');
+ *
+ * The alias `.respondsTo` can be used interchangeably with `.respondTo`.
+ *
+ * @name respondTo
+ * @alias respondsTo
+ * @param {String} method
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function respondTo (method, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , itself = flag(this, 'itself')
+ , context = ('function' === typeof obj && !itself)
+ ? obj.prototype[method]
+ : obj[method];
+
+ this.assert(
+ 'function' === typeof context
+ , 'expected #{this} to respond to ' + _.inspect(method)
+ , 'expected #{this} to not respond to ' + _.inspect(method)
+ );
+ }
+
+ Assertion.addMethod('respondTo', respondTo);
+ Assertion.addMethod('respondsTo', respondTo);
+
+ /**
+ * ### .itself
+ *
+ * Forces all `.respondTo` assertions that follow in the chain to behave as if
+ * the target is a non-function object, even if it's a function. Thus, it
+ * causes `.respondTo` to assert that the target has a method with the given
+ * name, rather than asserting that the target's `prototype` property has a
+ * method with the given name.
+ *
+ * function Cat () {}
+ * Cat.prototype.meow = function () {};
+ * Cat.hiss = function () {};
+ *
+ * expect(Cat).itself.to.respondTo('hiss').but.not.respondTo('meow');
+ *
+ * @name itself
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('itself', function () {
+ flag(this, 'itself', true);
+ });
+
+ /**
+ * ### .satisfy(matcher[, msg])
+ *
+ * Invokes the given `matcher` function with the target being passed as the
+ * first argument, and asserts that the value returned is truthy.
+ *
+ * expect(1).to.satisfy(function(num) {
+ * return num > 0;
+ * });
+ *
+ * Add `.not` earlier in the chain to negate `.satisfy`.
+ *
+ * expect(1).to.not.satisfy(function(num) {
+ * return num > 2;
+ * });
+ *
+ * `.satisfy` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect(1).to.satisfy(function(num) {
+ * return num > 2;
+ * }, 'nooo why fail??');
+ *
+ * expect(1, 'nooo why fail??').to.satisfy(function(num) {
+ * return num > 2;
+ * });
+ *
+ * The alias `.satisfies` can be used interchangeably with `.satisfy`.
+ *
+ * @name satisfy
+ * @alias satisfies
+ * @param {Function} matcher
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function satisfy (matcher, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object');
+ var result = matcher(obj);
+ this.assert(
+ result
+ , 'expected #{this} to satisfy ' + _.objDisplay(matcher)
+ , 'expected #{this} to not satisfy' + _.objDisplay(matcher)
+ , flag(this, 'negate') ? false : true
+ , result
+ );
+ }
+
+ Assertion.addMethod('satisfy', satisfy);
+ Assertion.addMethod('satisfies', satisfy);
+
+ /**
+ * ### .closeTo(expected, delta[, msg])
+ *
+ * Asserts that the target is a number that's within a given +/- `delta` range
+ * of the given number `expected`. However, it's often best to assert that the
+ * target is equal to its expected value.
+ *
+ * // Recommended
+ * expect(1.5).to.equal(1.5);
+ *
+ * // Not recommended
+ * expect(1.5).to.be.closeTo(1, 0.5);
+ * expect(1.5).to.be.closeTo(2, 0.5);
+ * expect(1.5).to.be.closeTo(1, 1);
+ *
+ * Add `.not` earlier in the chain to negate `.closeTo`.
+ *
+ * expect(1.5).to.equal(1.5); // Recommended
+ * expect(1.5).to.not.be.closeTo(3, 1); // Not recommended
+ *
+ * `.closeTo` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect(1.5).to.be.closeTo(3, 1, 'nooo why fail??');
+ * expect(1.5, 'nooo why fail??').to.be.closeTo(3, 1);
+ *
+ * The alias `.approximately` can be used interchangeably with `.closeTo`.
+ *
+ * @name closeTo
+ * @alias approximately
+ * @param {Number} expected
+ * @param {Number} delta
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function closeTo(expected, delta, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+
+ new Assertion(obj, flagMsg, ssfi, true).is.a('number');
+ if (typeof expected !== 'number' || typeof delta !== 'number') {
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+ throw new AssertionError(
+ flagMsg + 'the arguments to closeTo or approximately must be numbers',
+ undefined,
+ ssfi
+ );
+ }
+
+ this.assert(
+ Math.abs(obj - expected) <= delta
+ , 'expected #{this} to be close to ' + expected + ' +/- ' + delta
+ , 'expected #{this} not to be close to ' + expected + ' +/- ' + delta
+ );
+ }
+
+ Assertion.addMethod('closeTo', closeTo);
+ Assertion.addMethod('approximately', closeTo);
+
+ // Note: Duplicates are ignored if testing for inclusion instead of sameness.
+ function isSubsetOf(subset, superset, cmp, contains, ordered) {
+ if (!contains) {
+ if (subset.length !== superset.length) return false;
+ superset = superset.slice();
+ }
+
+ return subset.every(function(elem, idx) {
+ if (ordered) return cmp ? cmp(elem, superset[idx]) : elem === superset[idx];
+
+ if (!cmp) {
+ var matchIdx = superset.indexOf(elem);
+ if (matchIdx === -1) return false;
+
+ // Remove match from superset so not counted twice if duplicate in subset.
+ if (!contains) superset.splice(matchIdx, 1);
+ return true;
+ }
+
+ return superset.some(function(elem2, matchIdx) {
+ if (!cmp(elem, elem2)) return false;
+
+ // Remove match from superset so not counted twice if duplicate in subset.
+ if (!contains) superset.splice(matchIdx, 1);
+ return true;
+ });
+ });
+ }
+
+ /**
+ * ### .members(set[, msg])
+ *
+ * Asserts that the target array has the same members as the given array
+ * `set`.
+ *
+ * expect([1, 2, 3]).to.have.members([2, 1, 3]);
+ * expect([1, 2, 2]).to.have.members([2, 1, 2]);
+ *
+ * By default, members are compared using strict (`===`) equality. Add `.deep`
+ * earlier in the chain to use deep equality instead. See the `deep-eql`
+ * project page for info on the deep equality algorithm:
+ * https://github.com/chaijs/deep-eql.
+ *
+ * // Target array deeply (but not strictly) has member `{a: 1}`
+ * expect([{a: 1}]).to.have.deep.members([{a: 1}]);
+ * expect([{a: 1}]).to.not.have.members([{a: 1}]);
+ *
+ * By default, order doesn't matter. Add `.ordered` earlier in the chain to
+ * require that members appear in the same order.
+ *
+ * expect([1, 2, 3]).to.have.ordered.members([1, 2, 3]);
+ * expect([1, 2, 3]).to.have.members([2, 1, 3])
+ * .but.not.ordered.members([2, 1, 3]);
+ *
+ * By default, both arrays must be the same size. Add `.include` earlier in
+ * the chain to require that the target's members be a superset of the
+ * expected members. Note that duplicates are ignored in the subset when
+ * `.include` is added.
+ *
+ * // Target array is a superset of [1, 2] but not identical
+ * expect([1, 2, 3]).to.include.members([1, 2]);
+ * expect([1, 2, 3]).to.not.have.members([1, 2]);
+ *
+ * // Duplicates in the subset are ignored
+ * expect([1, 2, 3]).to.include.members([1, 2, 2, 2]);
+ *
+ * `.deep`, `.ordered`, and `.include` can all be combined. However, if
+ * `.include` and `.ordered` are combined, the ordering begins at the start of
+ * both arrays.
+ *
+ * expect([{a: 1}, {b: 2}, {c: 3}])
+ * .to.include.deep.ordered.members([{a: 1}, {b: 2}])
+ * .but.not.include.deep.ordered.members([{b: 2}, {c: 3}]);
+ *
+ * Add `.not` earlier in the chain to negate `.members`. However, it's
+ * dangerous to do so. The problem is that it creates uncertain expectations
+ * by asserting that the target array doesn't have all of the same members as
+ * the given array `set` but may or may not have some of them. It's often best
+ * to identify the exact output that's expected, and then write an assertion
+ * that only accepts that exact output.
+ *
+ * expect([1, 2]).to.not.include(3).and.not.include(4); // Recommended
+ * expect([1, 2]).to.not.have.members([3, 4]); // Not recommended
+ *
+ * `.members` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`.
+ *
+ * expect([1, 2]).to.have.members([1, 2, 3], 'nooo why fail??');
+ * expect([1, 2], 'nooo why fail??').to.have.members([1, 2, 3]);
+ *
+ * @name members
+ * @param {Array} set
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addMethod('members', function (subset, msg) {
+ if (msg) flag(this, 'message', msg);
+ var obj = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+
+ new Assertion(obj, flagMsg, ssfi, true).to.be.an('array');
+ new Assertion(subset, flagMsg, ssfi, true).to.be.an('array');
+
+ var contains = flag(this, 'contains');
+ var ordered = flag(this, 'ordered');
+
+ var subject, failMsg, failNegateMsg;
+
+ if (contains) {
+ subject = ordered ? 'an ordered superset' : 'a superset';
+ failMsg = 'expected #{this} to be ' + subject + ' of #{exp}';
+ failNegateMsg = 'expected #{this} to not be ' + subject + ' of #{exp}';
+ } else {
+ subject = ordered ? 'ordered members' : 'members';
+ failMsg = 'expected #{this} to have the same ' + subject + ' as #{exp}';
+ failNegateMsg = 'expected #{this} to not have the same ' + subject + ' as #{exp}';
+ }
+
+ var cmp = flag(this, 'deep') ? _.eql : undefined;
+
+ this.assert(
+ isSubsetOf(subset, obj, cmp, contains, ordered)
+ , failMsg
+ , failNegateMsg
+ , subset
+ , obj
+ , true
+ );
+ });
+
+ /**
+ * ### .oneOf(list[, msg])
+ *
+ * Asserts that the target is a member of the given array `list`. However,
+ * it's often best to assert that the target is equal to its expected value.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.be.oneOf([1, 2, 3]); // Not recommended
+ *
+ * Comparisons are performed using strict (`===`) equality.
+ *
+ * Add `.not` earlier in the chain to negate `.oneOf`.
+ *
+ * expect(1).to.equal(1); // Recommended
+ * expect(1).to.not.be.oneOf([2, 3, 4]); // Not recommended
+ *
+ * `.oneOf` accepts an optional `msg` argument which is a custom error message
+ * to show when the assertion fails. The message can also be given as the
+ * second argument to `expect`.
+ *
+ * expect(1).to.be.oneOf([2, 3, 4], 'nooo why fail??');
+ * expect(1, 'nooo why fail??').to.be.oneOf([2, 3, 4]);
+ *
+ * @name oneOf
+ * @param {Array<*>} list
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function oneOf (list, msg) {
+ if (msg) flag(this, 'message', msg);
+ var expected = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+ new Assertion(list, flagMsg, ssfi, true).to.be.an('array');
+
+ this.assert(
+ list.indexOf(expected) > -1
+ , 'expected #{this} to be one of #{exp}'
+ , 'expected #{this} to not be one of #{exp}'
+ , list
+ , expected
+ );
+ }
+
+ Assertion.addMethod('oneOf', oneOf);
+
+ /**
+ * ### .change(subject[, prop[, msg]])
+ *
+ * When one argument is provided, `.change` asserts that the given function
+ * `subject` returns a different value when it's invoked before the target
+ * function compared to when it's invoked afterward. However, it's often best
+ * to assert that `subject` is equal to its expected value.
+ *
+ * var dots = ''
+ * , addDot = function () { dots += '.'; }
+ * , getDots = function () { return dots; };
+ *
+ * // Recommended
+ * expect(getDots()).to.equal('');
+ * addDot();
+ * expect(getDots()).to.equal('.');
+ *
+ * // Not recommended
+ * expect(addDot).to.change(getDots);
+ *
+ * When two arguments are provided, `.change` asserts that the value of the
+ * given object `subject`'s `prop` property is different before invoking the
+ * target function compared to afterward.
+ *
+ * var myObj = {dots: ''}
+ * , addDot = function () { myObj.dots += '.'; };
+ *
+ * // Recommended
+ * expect(myObj).to.have.property('dots', '');
+ * addDot();
+ * expect(myObj).to.have.property('dots', '.');
+ *
+ * // Not recommended
+ * expect(addDot).to.change(myObj, 'dots');
+ *
+ * Strict (`===`) equality is used to compare before and after values.
+ *
+ * Add `.not` earlier in the chain to negate `.change`.
+ *
+ * var dots = ''
+ * , noop = function () {}
+ * , getDots = function () { return dots; };
+ *
+ * expect(noop).to.not.change(getDots);
+ *
+ * var myObj = {dots: ''}
+ * , noop = function () {};
+ *
+ * expect(noop).to.not.change(myObj, 'dots');
+ *
+ * `.change` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`. When not providing two arguments, always
+ * use the second form.
+ *
+ * var myObj = {dots: ''}
+ * , addDot = function () { myObj.dots += '.'; };
+ *
+ * expect(addDot).to.not.change(myObj, 'dots', 'nooo why fail??');
+ *
+ * var dots = ''
+ * , addDot = function () { dots += '.'; }
+ * , getDots = function () { return dots; };
+ *
+ * expect(addDot, 'nooo why fail??').to.not.change(getDots);
+ *
+ * `.change` also causes all `.by` assertions that follow in the chain to
+ * assert how much a numeric subject was increased or decreased by. However,
+ * it's dangerous to use `.change.by`. The problem is that it creates
+ * uncertain expectations by asserting that the subject either increases by
+ * the given delta, or that it decreases by the given delta. It's often best
+ * to identify the exact output that's expected, and then write an assertion
+ * that only accepts that exact output.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; }
+ * , subtractTwo = function () { myObj.val -= 2; };
+ *
+ * expect(addTwo).to.increase(myObj, 'val').by(2); // Recommended
+ * expect(addTwo).to.change(myObj, 'val').by(2); // Not recommended
+ *
+ * expect(subtractTwo).to.decrease(myObj, 'val').by(2); // Recommended
+ * expect(subtractTwo).to.change(myObj, 'val').by(2); // Not recommended
+ *
+ * The alias `.changes` can be used interchangeably with `.change`.
+ *
+ * @name change
+ * @alias changes
+ * @param {String} subject
+ * @param {String} prop name _optional_
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertChanges (subject, prop, msg) {
+ if (msg) flag(this, 'message', msg);
+ var fn = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+ new Assertion(fn, flagMsg, ssfi, true).is.a('function');
+
+ var initial;
+ if (!prop) {
+ new Assertion(subject, flagMsg, ssfi, true).is.a('function');
+ initial = subject();
+ } else {
+ new Assertion(subject, flagMsg, ssfi, true).to.have.property(prop);
+ initial = subject[prop];
+ }
+
+ fn();
+
+ var final = prop === undefined || prop === null ? subject() : subject[prop];
+ var msgObj = prop === undefined || prop === null ? initial : '.' + prop;
+
+ // This gets flagged because of the .by(delta) assertion
+ flag(this, 'deltaMsgObj', msgObj);
+ flag(this, 'initialDeltaValue', initial);
+ flag(this, 'finalDeltaValue', final);
+ flag(this, 'deltaBehavior', 'change');
+ flag(this, 'realDelta', final !== initial);
+
+ this.assert(
+ initial !== final
+ , 'expected ' + msgObj + ' to change'
+ , 'expected ' + msgObj + ' to not change'
+ );
+ }
+
+ Assertion.addMethod('change', assertChanges);
+ Assertion.addMethod('changes', assertChanges);
+
+ /**
+ * ### .increase(subject[, prop[, msg]])
+ *
+ * When one argument is provided, `.increase` asserts that the given function
+ * `subject` returns a greater number when it's invoked after invoking the
+ * target function compared to when it's invoked beforehand. `.increase` also
+ * causes all `.by` assertions that follow in the chain to assert how much
+ * greater of a number is returned. It's often best to assert that the return
+ * value increased by the expected amount, rather than asserting it increased
+ * by any amount.
+ *
+ * var val = 1
+ * , addTwo = function () { val += 2; }
+ * , getVal = function () { return val; };
+ *
+ * expect(addTwo).to.increase(getVal).by(2); // Recommended
+ * expect(addTwo).to.increase(getVal); // Not recommended
+ *
+ * When two arguments are provided, `.increase` asserts that the value of the
+ * given object `subject`'s `prop` property is greater after invoking the
+ * target function compared to beforehand.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; };
+ *
+ * expect(addTwo).to.increase(myObj, 'val').by(2); // Recommended
+ * expect(addTwo).to.increase(myObj, 'val'); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.increase`. However, it's
+ * dangerous to do so. The problem is that it creates uncertain expectations
+ * by asserting that the subject either decreases, or that it stays the same.
+ * It's often best to identify the exact output that's expected, and then
+ * write an assertion that only accepts that exact output.
+ *
+ * When the subject is expected to decrease, it's often best to assert that it
+ * decreased by the expected amount.
+ *
+ * var myObj = {val: 1}
+ * , subtractTwo = function () { myObj.val -= 2; };
+ *
+ * expect(subtractTwo).to.decrease(myObj, 'val').by(2); // Recommended
+ * expect(subtractTwo).to.not.increase(myObj, 'val'); // Not recommended
+ *
+ * When the subject is expected to stay the same, it's often best to assert
+ * exactly that.
+ *
+ * var myObj = {val: 1}
+ * , noop = function () {};
+ *
+ * expect(noop).to.not.change(myObj, 'val'); // Recommended
+ * expect(noop).to.not.increase(myObj, 'val'); // Not recommended
+ *
+ * `.increase` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`. When not providing two arguments, always
+ * use the second form.
+ *
+ * var myObj = {val: 1}
+ * , noop = function () {};
+ *
+ * expect(noop).to.increase(myObj, 'val', 'nooo why fail??');
+ *
+ * var val = 1
+ * , noop = function () {}
+ * , getVal = function () { return val; };
+ *
+ * expect(noop, 'nooo why fail??').to.increase(getVal);
+ *
+ * The alias `.increases` can be used interchangeably with `.increase`.
+ *
+ * @name increase
+ * @alias increases
+ * @param {String|Function} subject
+ * @param {String} prop name _optional_
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertIncreases (subject, prop, msg) {
+ if (msg) flag(this, 'message', msg);
+ var fn = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+ new Assertion(fn, flagMsg, ssfi, true).is.a('function');
+
+ var initial;
+ if (!prop) {
+ new Assertion(subject, flagMsg, ssfi, true).is.a('function');
+ initial = subject();
+ } else {
+ new Assertion(subject, flagMsg, ssfi, true).to.have.property(prop);
+ initial = subject[prop];
+ }
+
+ // Make sure that the target is a number
+ new Assertion(initial, flagMsg, ssfi, true).is.a('number');
+
+ fn();
+
+ var final = prop === undefined || prop === null ? subject() : subject[prop];
+ var msgObj = prop === undefined || prop === null ? initial : '.' + prop;
+
+ flag(this, 'deltaMsgObj', msgObj);
+ flag(this, 'initialDeltaValue', initial);
+ flag(this, 'finalDeltaValue', final);
+ flag(this, 'deltaBehavior', 'increase');
+ flag(this, 'realDelta', final - initial);
+
+ this.assert(
+ final - initial > 0
+ , 'expected ' + msgObj + ' to increase'
+ , 'expected ' + msgObj + ' to not increase'
+ );
+ }
+
+ Assertion.addMethod('increase', assertIncreases);
+ Assertion.addMethod('increases', assertIncreases);
+
+ /**
+ * ### .decrease(subject[, prop[, msg]])
+ *
+ * When one argument is provided, `.decrease` asserts that the given function
+ * `subject` returns a lesser number when it's invoked after invoking the
+ * target function compared to when it's invoked beforehand. `.decrease` also
+ * causes all `.by` assertions that follow in the chain to assert how much
+ * lesser of a number is returned. It's often best to assert that the return
+ * value decreased by the expected amount, rather than asserting it decreased
+ * by any amount.
+ *
+ * var val = 1
+ * , subtractTwo = function () { val -= 2; }
+ * , getVal = function () { return val; };
+ *
+ * expect(subtractTwo).to.decrease(getVal).by(2); // Recommended
+ * expect(subtractTwo).to.decrease(getVal); // Not recommended
+ *
+ * When two arguments are provided, `.decrease` asserts that the value of the
+ * given object `subject`'s `prop` property is lesser after invoking the
+ * target function compared to beforehand.
+ *
+ * var myObj = {val: 1}
+ * , subtractTwo = function () { myObj.val -= 2; };
+ *
+ * expect(subtractTwo).to.decrease(myObj, 'val').by(2); // Recommended
+ * expect(subtractTwo).to.decrease(myObj, 'val'); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.decrease`. However, it's
+ * dangerous to do so. The problem is that it creates uncertain expectations
+ * by asserting that the subject either increases, or that it stays the same.
+ * It's often best to identify the exact output that's expected, and then
+ * write an assertion that only accepts that exact output.
+ *
+ * When the subject is expected to increase, it's often best to assert that it
+ * increased by the expected amount.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; };
+ *
+ * expect(addTwo).to.increase(myObj, 'val').by(2); // Recommended
+ * expect(addTwo).to.not.decrease(myObj, 'val'); // Not recommended
+ *
+ * When the subject is expected to stay the same, it's often best to assert
+ * exactly that.
+ *
+ * var myObj = {val: 1}
+ * , noop = function () {};
+ *
+ * expect(noop).to.not.change(myObj, 'val'); // Recommended
+ * expect(noop).to.not.decrease(myObj, 'val'); // Not recommended
+ *
+ * `.decrease` accepts an optional `msg` argument which is a custom error
+ * message to show when the assertion fails. The message can also be given as
+ * the second argument to `expect`. When not providing two arguments, always
+ * use the second form.
+ *
+ * var myObj = {val: 1}
+ * , noop = function () {};
+ *
+ * expect(noop).to.decrease(myObj, 'val', 'nooo why fail??');
+ *
+ * var val = 1
+ * , noop = function () {}
+ * , getVal = function () { return val; };
+ *
+ * expect(noop, 'nooo why fail??').to.decrease(getVal);
+ *
+ * The alias `.decreases` can be used interchangeably with `.decrease`.
+ *
+ * @name decrease
+ * @alias decreases
+ * @param {String|Function} subject
+ * @param {String} prop name _optional_
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertDecreases (subject, prop, msg) {
+ if (msg) flag(this, 'message', msg);
+ var fn = flag(this, 'object')
+ , flagMsg = flag(this, 'message')
+ , ssfi = flag(this, 'ssfi');
+ new Assertion(fn, flagMsg, ssfi, true).is.a('function');
+
+ var initial;
+ if (!prop) {
+ new Assertion(subject, flagMsg, ssfi, true).is.a('function');
+ initial = subject();
+ } else {
+ new Assertion(subject, flagMsg, ssfi, true).to.have.property(prop);
+ initial = subject[prop];
+ }
+
+ // Make sure that the target is a number
+ new Assertion(initial, flagMsg, ssfi, true).is.a('number');
+
+ fn();
+
+ var final = prop === undefined || prop === null ? subject() : subject[prop];
+ var msgObj = prop === undefined || prop === null ? initial : '.' + prop;
+
+ flag(this, 'deltaMsgObj', msgObj);
+ flag(this, 'initialDeltaValue', initial);
+ flag(this, 'finalDeltaValue', final);
+ flag(this, 'deltaBehavior', 'decrease');
+ flag(this, 'realDelta', initial - final);
+
+ this.assert(
+ final - initial < 0
+ , 'expected ' + msgObj + ' to decrease'
+ , 'expected ' + msgObj + ' to not decrease'
+ );
+ }
+
+ Assertion.addMethod('decrease', assertDecreases);
+ Assertion.addMethod('decreases', assertDecreases);
+
+ /**
+ * ### .by(delta[, msg])
+ *
+ * When following an `.increase` assertion in the chain, `.by` asserts that
+ * the subject of the `.increase` assertion increased by the given `delta`.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; };
+ *
+ * expect(addTwo).to.increase(myObj, 'val').by(2);
+ *
+ * When following a `.decrease` assertion in the chain, `.by` asserts that the
+ * subject of the `.decrease` assertion decreased by the given `delta`.
+ *
+ * var myObj = {val: 1}
+ * , subtractTwo = function () { myObj.val -= 2; };
+ *
+ * expect(subtractTwo).to.decrease(myObj, 'val').by(2);
+ *
+ * When following a `.change` assertion in the chain, `.by` asserts that the
+ * subject of the `.change` assertion either increased or decreased by the
+ * given `delta`. However, it's dangerous to use `.change.by`. The problem is
+ * that it creates uncertain expectations. It's often best to identify the
+ * exact output that's expected, and then write an assertion that only accepts
+ * that exact output.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; }
+ * , subtractTwo = function () { myObj.val -= 2; };
+ *
+ * expect(addTwo).to.increase(myObj, 'val').by(2); // Recommended
+ * expect(addTwo).to.change(myObj, 'val').by(2); // Not recommended
+ *
+ * expect(subtractTwo).to.decrease(myObj, 'val').by(2); // Recommended
+ * expect(subtractTwo).to.change(myObj, 'val').by(2); // Not recommended
+ *
+ * Add `.not` earlier in the chain to negate `.by`. However, it's often best
+ * to assert that the subject changed by its expected delta, rather than
+ * asserting that it didn't change by one of countless unexpected deltas.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; };
+ *
+ * // Recommended
+ * expect(addTwo).to.increase(myObj, 'val').by(2);
+ *
+ * // Not recommended
+ * expect(addTwo).to.increase(myObj, 'val').but.not.by(3);
+ *
+ * `.by` accepts an optional `msg` argument which is a custom error message to
+ * show when the assertion fails. The message can also be given as the second
+ * argument to `expect`.
+ *
+ * var myObj = {val: 1}
+ * , addTwo = function () { myObj.val += 2; };
+ *
+ * expect(addTwo).to.increase(myObj, 'val').by(3, 'nooo why fail??');
+ * expect(addTwo, 'nooo why fail??').to.increase(myObj, 'val').by(3);
+ *
+ * @name by
+ * @param {Number} delta
+ * @param {String} msg _optional_
+ * @namespace BDD
+ * @api public
+ */
+
+ function assertDelta(delta, msg) {
+ if (msg) flag(this, 'message', msg);
+
+ var msgObj = flag(this, 'deltaMsgObj');
+ var initial = flag(this, 'initialDeltaValue');
+ var final = flag(this, 'finalDeltaValue');
+ var behavior = flag(this, 'deltaBehavior');
+ var realDelta = flag(this, 'realDelta');
+
+ var expression;
+ if (behavior === 'change') {
+ expression = Math.abs(final - initial) === Math.abs(delta);
+ } else {
+ expression = realDelta === Math.abs(delta);
+ }
+
+ this.assert(
+ expression
+ , 'expected ' + msgObj + ' to ' + behavior + ' by ' + delta
+ , 'expected ' + msgObj + ' to not ' + behavior + ' by ' + delta
+ );
+ }
+
+ Assertion.addMethod('by', assertDelta);
+
+ /**
+ * ### .extensible
+ *
+ * Asserts that the target is extensible, which means that new properties can
+ * be added to it. Primitives are never extensible.
+ *
+ * expect({a: 1}).to.be.extensible;
+ *
+ * Add `.not` earlier in the chain to negate `.extensible`.
+ *
+ * var nonExtensibleObject = Object.preventExtensions({})
+ * , sealedObject = Object.seal({})
+ * , frozenObject = Object.freeze({});
+ *
+ * expect(nonExtensibleObject).to.not.be.extensible;
+ * expect(sealedObject).to.not.be.extensible;
+ * expect(frozenObject).to.not.be.extensible;
+ * expect(1).to.not.be.extensible;
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect(1, 'nooo why fail??').to.be.extensible;
+ *
+ * @name extensible
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('extensible', function() {
+ var obj = flag(this, 'object');
+
+ // In ES5, if the argument to this method is a primitive, then it will cause a TypeError.
+ // In ES6, a non-object argument will be treated as if it was a non-extensible ordinary object, simply return false.
+ // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible
+ // The following provides ES6 behavior for ES5 environments.
+
+ var isExtensible = obj === Object(obj) && Object.isExtensible(obj);
+
+ this.assert(
+ isExtensible
+ , 'expected #{this} to be extensible'
+ , 'expected #{this} to not be extensible'
+ );
+ });
+
+ /**
+ * ### .sealed
+ *
+ * Asserts that the target is sealed, which means that new properties can't be
+ * added to it, and its existing properties can't be reconfigured or deleted.
+ * However, it's possible that its existing properties can still be reassigned
+ * to different values. Primitives are always sealed.
+ *
+ * var sealedObject = Object.seal({});
+ * var frozenObject = Object.freeze({});
+ *
+ * expect(sealedObject).to.be.sealed;
+ * expect(frozenObject).to.be.sealed;
+ * expect(1).to.be.sealed;
+ *
+ * Add `.not` earlier in the chain to negate `.sealed`.
+ *
+ * expect({a: 1}).to.not.be.sealed;
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect({a: 1}, 'nooo why fail??').to.be.sealed;
+ *
+ * @name sealed
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('sealed', function() {
+ var obj = flag(this, 'object');
+
+ // In ES5, if the argument to this method is a primitive, then it will cause a TypeError.
+ // In ES6, a non-object argument will be treated as if it was a sealed ordinary object, simply return true.
+ // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isSealed
+ // The following provides ES6 behavior for ES5 environments.
+
+ var isSealed = obj === Object(obj) ? Object.isSealed(obj) : true;
+
+ this.assert(
+ isSealed
+ , 'expected #{this} to be sealed'
+ , 'expected #{this} to not be sealed'
+ );
+ });
+
+ /**
+ * ### .frozen
+ *
+ * Asserts that the target is frozen, which means that new properties can't be
+ * added to it, and its existing properties can't be reassigned to different
+ * values, reconfigured, or deleted. Primitives are always frozen.
+ *
+ * var frozenObject = Object.freeze({});
+ *
+ * expect(frozenObject).to.be.frozen;
+ * expect(1).to.be.frozen;
+ *
+ * Add `.not` earlier in the chain to negate `.frozen`.
+ *
+ * expect({a: 1}).to.not.be.frozen;
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect({a: 1}, 'nooo why fail??').to.be.frozen;
+ *
+ * @name frozen
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('frozen', function() {
+ var obj = flag(this, 'object');
+
+ // In ES5, if the argument to this method is a primitive, then it will cause a TypeError.
+ // In ES6, a non-object argument will be treated as if it was a frozen ordinary object, simply return true.
+ // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isFrozen
+ // The following provides ES6 behavior for ES5 environments.
+
+ var isFrozen = obj === Object(obj) ? Object.isFrozen(obj) : true;
+
+ this.assert(
+ isFrozen
+ , 'expected #{this} to be frozen'
+ , 'expected #{this} to not be frozen'
+ );
+ });
+
+ /**
+ * ### .finite
+ *
+ * Asserts that the target is a number, and isn't `NaN` or positive/negative
+ * `Infinity`.
+ *
+ * expect(1).to.be.finite;
+ *
+ * Add `.not` earlier in the chain to negate `.finite`. However, it's
+ * dangerous to do so. The problem is that it creates uncertain expectations
+ * by asserting that the subject either isn't a number, or that it's `NaN`, or
+ * that it's positive `Infinity`, or that it's negative `Infinity`. It's often
+ * best to identify the exact output that's expected, and then write an
+ * assertion that only accepts that exact output.
+ *
+ * When the target isn't expected to be a number, it's often best to assert
+ * that it's the expected type, rather than asserting that it isn't one of
+ * many unexpected types.
+ *
+ * expect('foo').to.be.a('string'); // Recommended
+ * expect('foo').to.not.be.finite; // Not recommended
+ *
+ * When the target is expected to be `NaN`, it's often best to assert exactly
+ * that.
+ *
+ * expect(NaN).to.be.NaN; // Recommended
+ * expect(NaN).to.not.be.finite; // Not recommended
+ *
+ * When the target is expected to be positive infinity, it's often best to
+ * assert exactly that.
+ *
+ * expect(Infinity).to.equal(Infinity); // Recommended
+ * expect(Infinity).to.not.be.finite; // Not recommended
+ *
+ * When the target is expected to be negative infinity, it's often best to
+ * assert exactly that.
+ *
+ * expect(-Infinity).to.equal(-Infinity); // Recommended
+ * expect(-Infinity).to.not.be.finite; // Not recommended
+ *
+ * A custom error message can be given as the second argument to `expect`.
+ *
+ * expect('foo', 'nooo why fail??').to.be.finite;
+ *
+ * @name finite
+ * @namespace BDD
+ * @api public
+ */
+
+ Assertion.addProperty('finite', function(msg) {
+ var obj = flag(this, 'object');
+
+ this.assert(
+ typeof obj === 'number' && isFinite(obj)
+ , 'expected #{this} to be a finite number'
+ , 'expected #{this} to not be a finite number'
+ );
+ });
+};
+
+},{}],6:[function(require,module,exports){
+/*!
+ * chai
+ * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+module.exports = function (chai, util) {
+ /*!
+ * Chai dependencies.
+ */
+
+ var Assertion = chai.Assertion
+ , flag = util.flag;
+
+ /*!
+ * Module export.
+ */
+
+ /**
+ * ### assert(expression, message)
+ *
+ * Write your own test expressions.
+ *
+ * assert('foo' !== 'bar', 'foo is not bar');
+ * assert(Array.isArray([]), 'empty arrays are arrays');
+ *
+ * @param {Mixed} expression to test for truthiness
+ * @param {String} message to display on error
+ * @name assert
+ * @namespace Assert
+ * @api public
+ */
+
+ var assert = chai.assert = function (express, errmsg) {
+ var test = new Assertion(null, null, chai.assert, true);
+ test.assert(
+ express
+ , errmsg
+ , '[ negation message unavailable ]'
+ );
+ };
+
+ /**
+ * ### .fail([message])
+ * ### .fail(actual, expected, [message], [operator])
+ *
+ * Throw a failure. Node.js `assert` module-compatible.
+ *
+ * assert.fail();
+ * assert.fail("custom error message");
+ * assert.fail(1, 2);
+ * assert.fail(1, 2, "custom error message");
+ * assert.fail(1, 2, "custom error message", ">");
+ * assert.fail(1, 2, undefined, ">");
+ *
+ * @name fail
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @param {String} operator
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.fail = function (actual, expected, message, operator) {
+ if (arguments.length < 2) {
+ // Comply with Node's fail([message]) interface
+
+ message = actual;
+ actual = undefined;
+ }
+
+ message = message || 'assert.fail()';
+ throw new chai.AssertionError(message, {
+ actual: actual
+ , expected: expected
+ , operator: operator
+ }, assert.fail);
+ };
+
+ /**
+ * ### .isOk(object, [message])
+ *
+ * Asserts that `object` is truthy.
+ *
+ * assert.isOk('everything', 'everything is ok');
+ * assert.isOk(false, 'this will fail');
+ *
+ * @name isOk
+ * @alias ok
+ * @param {Mixed} object to test
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isOk = function (val, msg) {
+ new Assertion(val, msg, assert.isOk, true).is.ok;
+ };
+
+ /**
+ * ### .isNotOk(object, [message])
+ *
+ * Asserts that `object` is falsy.
+ *
+ * assert.isNotOk('everything', 'this will fail');
+ * assert.isNotOk(false, 'this will pass');
+ *
+ * @name isNotOk
+ * @alias notOk
+ * @param {Mixed} object to test
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotOk = function (val, msg) {
+ new Assertion(val, msg, assert.isNotOk, true).is.not.ok;
+ };
+
+ /**
+ * ### .equal(actual, expected, [message])
+ *
+ * Asserts non-strict equality (`==`) of `actual` and `expected`.
+ *
+ * assert.equal(3, '3', '== coerces values to strings');
+ *
+ * @name equal
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.equal = function (act, exp, msg) {
+ var test = new Assertion(act, msg, assert.equal, true);
+
+ test.assert(
+ exp == flag(test, 'object')
+ , 'expected #{this} to equal #{exp}'
+ , 'expected #{this} to not equal #{act}'
+ , exp
+ , act
+ , true
+ );
+ };
+
+ /**
+ * ### .notEqual(actual, expected, [message])
+ *
+ * Asserts non-strict inequality (`!=`) of `actual` and `expected`.
+ *
+ * assert.notEqual(3, 4, 'these numbers are not equal');
+ *
+ * @name notEqual
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notEqual = function (act, exp, msg) {
+ var test = new Assertion(act, msg, assert.notEqual, true);
+
+ test.assert(
+ exp != flag(test, 'object')
+ , 'expected #{this} to not equal #{exp}'
+ , 'expected #{this} to equal #{act}'
+ , exp
+ , act
+ , true
+ );
+ };
+
+ /**
+ * ### .strictEqual(actual, expected, [message])
+ *
+ * Asserts strict equality (`===`) of `actual` and `expected`.
+ *
+ * assert.strictEqual(true, true, 'these booleans are strictly equal');
+ *
+ * @name strictEqual
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.strictEqual = function (act, exp, msg) {
+ new Assertion(act, msg, assert.strictEqual, true).to.equal(exp);
+ };
+
+ /**
+ * ### .notStrictEqual(actual, expected, [message])
+ *
+ * Asserts strict inequality (`!==`) of `actual` and `expected`.
+ *
+ * assert.notStrictEqual(3, '3', 'no coercion for strict equality');
+ *
+ * @name notStrictEqual
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notStrictEqual = function (act, exp, msg) {
+ new Assertion(act, msg, assert.notStrictEqual, true).to.not.equal(exp);
+ };
+
+ /**
+ * ### .deepEqual(actual, expected, [message])
+ *
+ * Asserts that `actual` is deeply equal to `expected`.
+ *
+ * assert.deepEqual({ tea: 'green' }, { tea: 'green' });
+ *
+ * @name deepEqual
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @alias deepStrictEqual
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.deepEqual = assert.deepStrictEqual = function (act, exp, msg) {
+ new Assertion(act, msg, assert.deepEqual, true).to.eql(exp);
+ };
+
+ /**
+ * ### .notDeepEqual(actual, expected, [message])
+ *
+ * Assert that `actual` is not deeply equal to `expected`.
+ *
+ * assert.notDeepEqual({ tea: 'green' }, { tea: 'jasmine' });
+ *
+ * @name notDeepEqual
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notDeepEqual = function (act, exp, msg) {
+ new Assertion(act, msg, assert.notDeepEqual, true).to.not.eql(exp);
+ };
+
+ /**
+ * ### .isAbove(valueToCheck, valueToBeAbove, [message])
+ *
+ * Asserts `valueToCheck` is strictly greater than (>) `valueToBeAbove`.
+ *
+ * assert.isAbove(5, 2, '5 is strictly greater than 2');
+ *
+ * @name isAbove
+ * @param {Mixed} valueToCheck
+ * @param {Mixed} valueToBeAbove
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isAbove = function (val, abv, msg) {
+ new Assertion(val, msg, assert.isAbove, true).to.be.above(abv);
+ };
+
+ /**
+ * ### .isAtLeast(valueToCheck, valueToBeAtLeast, [message])
+ *
+ * Asserts `valueToCheck` is greater than or equal to (>=) `valueToBeAtLeast`.
+ *
+ * assert.isAtLeast(5, 2, '5 is greater or equal to 2');
+ * assert.isAtLeast(3, 3, '3 is greater or equal to 3');
+ *
+ * @name isAtLeast
+ * @param {Mixed} valueToCheck
+ * @param {Mixed} valueToBeAtLeast
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isAtLeast = function (val, atlst, msg) {
+ new Assertion(val, msg, assert.isAtLeast, true).to.be.least(atlst);
+ };
+
+ /**
+ * ### .isBelow(valueToCheck, valueToBeBelow, [message])
+ *
+ * Asserts `valueToCheck` is strictly less than (<) `valueToBeBelow`.
+ *
+ * assert.isBelow(3, 6, '3 is strictly less than 6');
+ *
+ * @name isBelow
+ * @param {Mixed} valueToCheck
+ * @param {Mixed} valueToBeBelow
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isBelow = function (val, blw, msg) {
+ new Assertion(val, msg, assert.isBelow, true).to.be.below(blw);
+ };
+
+ /**
+ * ### .isAtMost(valueToCheck, valueToBeAtMost, [message])
+ *
+ * Asserts `valueToCheck` is less than or equal to (<=) `valueToBeAtMost`.
+ *
+ * assert.isAtMost(3, 6, '3 is less than or equal to 6');
+ * assert.isAtMost(4, 4, '4 is less than or equal to 4');
+ *
+ * @name isAtMost
+ * @param {Mixed} valueToCheck
+ * @param {Mixed} valueToBeAtMost
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isAtMost = function (val, atmst, msg) {
+ new Assertion(val, msg, assert.isAtMost, true).to.be.most(atmst);
+ };
+
+ /**
+ * ### .isTrue(value, [message])
+ *
+ * Asserts that `value` is true.
+ *
+ * var teaServed = true;
+ * assert.isTrue(teaServed, 'the tea has been served');
+ *
+ * @name isTrue
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isTrue = function (val, msg) {
+ new Assertion(val, msg, assert.isTrue, true).is['true'];
+ };
+
+ /**
+ * ### .isNotTrue(value, [message])
+ *
+ * Asserts that `value` is not true.
+ *
+ * var tea = 'tasty chai';
+ * assert.isNotTrue(tea, 'great, time for tea!');
+ *
+ * @name isNotTrue
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotTrue = function (val, msg) {
+ new Assertion(val, msg, assert.isNotTrue, true).to.not.equal(true);
+ };
+
+ /**
+ * ### .isFalse(value, [message])
+ *
+ * Asserts that `value` is false.
+ *
+ * var teaServed = false;
+ * assert.isFalse(teaServed, 'no tea yet? hmm...');
+ *
+ * @name isFalse
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isFalse = function (val, msg) {
+ new Assertion(val, msg, assert.isFalse, true).is['false'];
+ };
+
+ /**
+ * ### .isNotFalse(value, [message])
+ *
+ * Asserts that `value` is not false.
+ *
+ * var tea = 'tasty chai';
+ * assert.isNotFalse(tea, 'great, time for tea!');
+ *
+ * @name isNotFalse
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotFalse = function (val, msg) {
+ new Assertion(val, msg, assert.isNotFalse, true).to.not.equal(false);
+ };
+
+ /**
+ * ### .isNull(value, [message])
+ *
+ * Asserts that `value` is null.
+ *
+ * assert.isNull(err, 'there was no error');
+ *
+ * @name isNull
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNull = function (val, msg) {
+ new Assertion(val, msg, assert.isNull, true).to.equal(null);
+ };
+
+ /**
+ * ### .isNotNull(value, [message])
+ *
+ * Asserts that `value` is not null.
+ *
+ * var tea = 'tasty chai';
+ * assert.isNotNull(tea, 'great, time for tea!');
+ *
+ * @name isNotNull
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotNull = function (val, msg) {
+ new Assertion(val, msg, assert.isNotNull, true).to.not.equal(null);
+ };
+
+ /**
+ * ### .isNaN
+ *
+ * Asserts that value is NaN.
+ *
+ * assert.isNaN(NaN, 'NaN is NaN');
+ *
+ * @name isNaN
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNaN = function (val, msg) {
+ new Assertion(val, msg, assert.isNaN, true).to.be.NaN;
+ };
+
+ /**
+ * ### .isNotNaN
+ *
+ * Asserts that value is not NaN.
+ *
+ * assert.isNotNaN(4, '4 is not NaN');
+ *
+ * @name isNotNaN
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+ assert.isNotNaN = function (val, msg) {
+ new Assertion(val, msg, assert.isNotNaN, true).not.to.be.NaN;
+ };
+
+ /**
+ * ### .exists
+ *
+ * Asserts that the target is neither `null` nor `undefined`.
+ *
+ * var foo = 'hi';
+ *
+ * assert.exists(foo, 'foo is neither `null` nor `undefined`');
+ *
+ * @name exists
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.exists = function (val, msg) {
+ new Assertion(val, msg, assert.exists, true).to.exist;
+ };
+
+ /**
+ * ### .notExists
+ *
+ * Asserts that the target is either `null` or `undefined`.
+ *
+ * var bar = null
+ * , baz;
+ *
+ * assert.notExists(bar);
+ * assert.notExists(baz, 'baz is either null or undefined');
+ *
+ * @name notExists
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notExists = function (val, msg) {
+ new Assertion(val, msg, assert.notExists, true).to.not.exist;
+ };
+
+ /**
+ * ### .isUndefined(value, [message])
+ *
+ * Asserts that `value` is `undefined`.
+ *
+ * var tea;
+ * assert.isUndefined(tea, 'no tea defined');
+ *
+ * @name isUndefined
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isUndefined = function (val, msg) {
+ new Assertion(val, msg, assert.isUndefined, true).to.equal(undefined);
+ };
+
+ /**
+ * ### .isDefined(value, [message])
+ *
+ * Asserts that `value` is not `undefined`.
+ *
+ * var tea = 'cup of chai';
+ * assert.isDefined(tea, 'tea has been defined');
+ *
+ * @name isDefined
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isDefined = function (val, msg) {
+ new Assertion(val, msg, assert.isDefined, true).to.not.equal(undefined);
+ };
+
+ /**
+ * ### .isFunction(value, [message])
+ *
+ * Asserts that `value` is a function.
+ *
+ * function serveTea() { return 'cup of tea'; };
+ * assert.isFunction(serveTea, 'great, we can have tea now');
+ *
+ * @name isFunction
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isFunction = function (val, msg) {
+ new Assertion(val, msg, assert.isFunction, true).to.be.a('function');
+ };
+
+ /**
+ * ### .isNotFunction(value, [message])
+ *
+ * Asserts that `value` is _not_ a function.
+ *
+ * var serveTea = [ 'heat', 'pour', 'sip' ];
+ * assert.isNotFunction(serveTea, 'great, we have listed the steps');
+ *
+ * @name isNotFunction
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotFunction = function (val, msg) {
+ new Assertion(val, msg, assert.isNotFunction, true).to.not.be.a('function');
+ };
+
+ /**
+ * ### .isObject(value, [message])
+ *
+ * Asserts that `value` is an object of type 'Object' (as revealed by `Object.prototype.toString`).
+ * _The assertion does not match subclassed objects._
+ *
+ * var selection = { name: 'Chai', serve: 'with spices' };
+ * assert.isObject(selection, 'tea selection is an object');
+ *
+ * @name isObject
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isObject = function (val, msg) {
+ new Assertion(val, msg, assert.isObject, true).to.be.a('object');
+ };
+
+ /**
+ * ### .isNotObject(value, [message])
+ *
+ * Asserts that `value` is _not_ an object of type 'Object' (as revealed by `Object.prototype.toString`).
+ *
+ * var selection = 'chai'
+ * assert.isNotObject(selection, 'tea selection is not an object');
+ * assert.isNotObject(null, 'null is not an object');
+ *
+ * @name isNotObject
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotObject = function (val, msg) {
+ new Assertion(val, msg, assert.isNotObject, true).to.not.be.a('object');
+ };
+
+ /**
+ * ### .isArray(value, [message])
+ *
+ * Asserts that `value` is an array.
+ *
+ * var menu = [ 'green', 'chai', 'oolong' ];
+ * assert.isArray(menu, 'what kind of tea do we want?');
+ *
+ * @name isArray
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isArray = function (val, msg) {
+ new Assertion(val, msg, assert.isArray, true).to.be.an('array');
+ };
+
+ /**
+ * ### .isNotArray(value, [message])
+ *
+ * Asserts that `value` is _not_ an array.
+ *
+ * var menu = 'green|chai|oolong';
+ * assert.isNotArray(menu, 'what kind of tea do we want?');
+ *
+ * @name isNotArray
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotArray = function (val, msg) {
+ new Assertion(val, msg, assert.isNotArray, true).to.not.be.an('array');
+ };
+
+ /**
+ * ### .isString(value, [message])
+ *
+ * Asserts that `value` is a string.
+ *
+ * var teaOrder = 'chai';
+ * assert.isString(teaOrder, 'order placed');
+ *
+ * @name isString
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isString = function (val, msg) {
+ new Assertion(val, msg, assert.isString, true).to.be.a('string');
+ };
+
+ /**
+ * ### .isNotString(value, [message])
+ *
+ * Asserts that `value` is _not_ a string.
+ *
+ * var teaOrder = 4;
+ * assert.isNotString(teaOrder, 'order placed');
+ *
+ * @name isNotString
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotString = function (val, msg) {
+ new Assertion(val, msg, assert.isNotString, true).to.not.be.a('string');
+ };
+
+ /**
+ * ### .isNumber(value, [message])
+ *
+ * Asserts that `value` is a number.
+ *
+ * var cups = 2;
+ * assert.isNumber(cups, 'how many cups');
+ *
+ * @name isNumber
+ * @param {Number} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNumber = function (val, msg) {
+ new Assertion(val, msg, assert.isNumber, true).to.be.a('number');
+ };
+
+ /**
+ * ### .isNotNumber(value, [message])
+ *
+ * Asserts that `value` is _not_ a number.
+ *
+ * var cups = '2 cups please';
+ * assert.isNotNumber(cups, 'how many cups');
+ *
+ * @name isNotNumber
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotNumber = function (val, msg) {
+ new Assertion(val, msg, assert.isNotNumber, true).to.not.be.a('number');
+ };
+
+ /**
+ * ### .isFinite(value, [message])
+ *
+ * Asserts that `value` is a finite number. Unlike `.isNumber`, this will fail for `NaN` and `Infinity`.
+ *
+ * var cups = 2;
+ * assert.isFinite(cups, 'how many cups');
+ *
+ * assert.isFinite(NaN); // throws
+ *
+ * @name isFinite
+ * @param {Number} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isFinite = function (val, msg) {
+ new Assertion(val, msg, assert.isFinite, true).to.be.finite;
+ };
+
+ /**
+ * ### .isBoolean(value, [message])
+ *
+ * Asserts that `value` is a boolean.
+ *
+ * var teaReady = true
+ * , teaServed = false;
+ *
+ * assert.isBoolean(teaReady, 'is the tea ready');
+ * assert.isBoolean(teaServed, 'has tea been served');
+ *
+ * @name isBoolean
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isBoolean = function (val, msg) {
+ new Assertion(val, msg, assert.isBoolean, true).to.be.a('boolean');
+ };
+
+ /**
+ * ### .isNotBoolean(value, [message])
+ *
+ * Asserts that `value` is _not_ a boolean.
+ *
+ * var teaReady = 'yep'
+ * , teaServed = 'nope';
+ *
+ * assert.isNotBoolean(teaReady, 'is the tea ready');
+ * assert.isNotBoolean(teaServed, 'has tea been served');
+ *
+ * @name isNotBoolean
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotBoolean = function (val, msg) {
+ new Assertion(val, msg, assert.isNotBoolean, true).to.not.be.a('boolean');
+ };
+
+ /**
+ * ### .typeOf(value, name, [message])
+ *
+ * Asserts that `value`'s type is `name`, as determined by
+ * `Object.prototype.toString`.
+ *
+ * assert.typeOf({ tea: 'chai' }, 'object', 'we have an object');
+ * assert.typeOf(['chai', 'jasmine'], 'array', 'we have an array');
+ * assert.typeOf('tea', 'string', 'we have a string');
+ * assert.typeOf(/tea/, 'regexp', 'we have a regular expression');
+ * assert.typeOf(null, 'null', 'we have a null');
+ * assert.typeOf(undefined, 'undefined', 'we have an undefined');
+ *
+ * @name typeOf
+ * @param {Mixed} value
+ * @param {String} name
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.typeOf = function (val, type, msg) {
+ new Assertion(val, msg, assert.typeOf, true).to.be.a(type);
+ };
+
+ /**
+ * ### .notTypeOf(value, name, [message])
+ *
+ * Asserts that `value`'s type is _not_ `name`, as determined by
+ * `Object.prototype.toString`.
+ *
+ * assert.notTypeOf('tea', 'number', 'strings are not numbers');
+ *
+ * @name notTypeOf
+ * @param {Mixed} value
+ * @param {String} typeof name
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notTypeOf = function (val, type, msg) {
+ new Assertion(val, msg, assert.notTypeOf, true).to.not.be.a(type);
+ };
+
+ /**
+ * ### .instanceOf(object, constructor, [message])
+ *
+ * Asserts that `value` is an instance of `constructor`.
+ *
+ * var Tea = function (name) { this.name = name; }
+ * , chai = new Tea('chai');
+ *
+ * assert.instanceOf(chai, Tea, 'chai is an instance of tea');
+ *
+ * @name instanceOf
+ * @param {Object} object
+ * @param {Constructor} constructor
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.instanceOf = function (val, type, msg) {
+ new Assertion(val, msg, assert.instanceOf, true).to.be.instanceOf(type);
+ };
+
+ /**
+ * ### .notInstanceOf(object, constructor, [message])
+ *
+ * Asserts `value` is not an instance of `constructor`.
+ *
+ * var Tea = function (name) { this.name = name; }
+ * , chai = new String('chai');
+ *
+ * assert.notInstanceOf(chai, Tea, 'chai is not an instance of tea');
+ *
+ * @name notInstanceOf
+ * @param {Object} object
+ * @param {Constructor} constructor
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notInstanceOf = function (val, type, msg) {
+ new Assertion(val, msg, assert.notInstanceOf, true)
+ .to.not.be.instanceOf(type);
+ };
+
+ /**
+ * ### .include(haystack, needle, [message])
+ *
+ * Asserts that `haystack` includes `needle`. Can be used to assert the
+ * inclusion of a value in an array, a substring in a string, or a subset of
+ * properties in an object.
+ *
+ * assert.include([1,2,3], 2, 'array contains value');
+ * assert.include('foobar', 'foo', 'string contains substring');
+ * assert.include({ foo: 'bar', hello: 'universe' }, { foo: 'bar' }, 'object contains property');
+ *
+ * Strict equality (===) is used. When asserting the inclusion of a value in
+ * an array, the array is searched for an element that's strictly equal to the
+ * given value. When asserting a subset of properties in an object, the object
+ * is searched for the given property keys, checking that each one is present
+ * and strictly equal to the given property value. For instance:
+ *
+ * var obj1 = {a: 1}
+ * , obj2 = {b: 2};
+ * assert.include([obj1, obj2], obj1);
+ * assert.include({foo: obj1, bar: obj2}, {foo: obj1});
+ * assert.include({foo: obj1, bar: obj2}, {foo: obj1, bar: obj2});
+ *
+ * @name include
+ * @param {Array|String} haystack
+ * @param {Mixed} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.include = function (exp, inc, msg) {
+ new Assertion(exp, msg, assert.include, true).include(inc);
+ };
+
+ /**
+ * ### .notInclude(haystack, needle, [message])
+ *
+ * Asserts that `haystack` does not include `needle`. Can be used to assert
+ * the absence of a value in an array, a substring in a string, or a subset of
+ * properties in an object.
+ *
+ * assert.notInclude([1,2,3], 4, "array doesn't contain value");
+ * assert.notInclude('foobar', 'baz', "string doesn't contain substring");
+ * assert.notInclude({ foo: 'bar', hello: 'universe' }, { foo: 'baz' }, 'object doesn't contain property');
+ *
+ * Strict equality (===) is used. When asserting the absence of a value in an
+ * array, the array is searched to confirm the absence of an element that's
+ * strictly equal to the given value. When asserting a subset of properties in
+ * an object, the object is searched to confirm that at least one of the given
+ * property keys is either not present or not strictly equal to the given
+ * property value. For instance:
+ *
+ * var obj1 = {a: 1}
+ * , obj2 = {b: 2};
+ * assert.notInclude([obj1, obj2], {a: 1});
+ * assert.notInclude({foo: obj1, bar: obj2}, {foo: {a: 1}});
+ * assert.notInclude({foo: obj1, bar: obj2}, {foo: obj1, bar: {b: 2}});
+ *
+ * @name notInclude
+ * @param {Array|String} haystack
+ * @param {Mixed} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notInclude = function (exp, inc, msg) {
+ new Assertion(exp, msg, assert.notInclude, true).not.include(inc);
+ };
+
+ /**
+ * ### .deepInclude(haystack, needle, [message])
+ *
+ * Asserts that `haystack` includes `needle`. Can be used to assert the
+ * inclusion of a value in an array or a subset of properties in an object.
+ * Deep equality is used.
+ *
+ * var obj1 = {a: 1}
+ * , obj2 = {b: 2};
+ * assert.deepInclude([obj1, obj2], {a: 1});
+ * assert.deepInclude({foo: obj1, bar: obj2}, {foo: {a: 1}});
+ * assert.deepInclude({foo: obj1, bar: obj2}, {foo: {a: 1}, bar: {b: 2}});
+ *
+ * @name deepInclude
+ * @param {Array|String} haystack
+ * @param {Mixed} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.deepInclude = function (exp, inc, msg) {
+ new Assertion(exp, msg, assert.deepInclude, true).deep.include(inc);
+ };
+
+ /**
+ * ### .notDeepInclude(haystack, needle, [message])
+ *
+ * Asserts that `haystack` does not include `needle`. Can be used to assert
+ * the absence of a value in an array or a subset of properties in an object.
+ * Deep equality is used.
+ *
+ * var obj1 = {a: 1}
+ * , obj2 = {b: 2};
+ * assert.notDeepInclude([obj1, obj2], {a: 9});
+ * assert.notDeepInclude({foo: obj1, bar: obj2}, {foo: {a: 9}});
+ * assert.notDeepInclude({foo: obj1, bar: obj2}, {foo: {a: 1}, bar: {b: 9}});
+ *
+ * @name notDeepInclude
+ * @param {Array|String} haystack
+ * @param {Mixed} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notDeepInclude = function (exp, inc, msg) {
+ new Assertion(exp, msg, assert.notDeepInclude, true).not.deep.include(inc);
+ };
+
+ /**
+ * ### .nestedInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' includes 'needle'.
+ * Can be used to assert the inclusion of a subset of properties in an
+ * object.
+ * Enables the use of dot- and bracket-notation for referencing nested
+ * properties.
+ * '[]' and '.' in property names can be escaped using double backslashes.
+ *
+ * assert.nestedInclude({'.a': {'b': 'x'}}, {'\\.a.[b]': 'x'});
+ * assert.nestedInclude({'a': {'[b]': 'x'}}, {'a.\\[b\\]': 'x'});
+ *
+ * @name nestedInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.nestedInclude = function (exp, inc, msg) {
+ new Assertion(exp, msg, assert.nestedInclude, true).nested.include(inc);
+ };
+
+ /**
+ * ### .notNestedInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' does not include 'needle'.
+ * Can be used to assert the absence of a subset of properties in an
+ * object.
+ * Enables the use of dot- and bracket-notation for referencing nested
+ * properties.
+ * '[]' and '.' in property names can be escaped using double backslashes.
+ *
+ * assert.notNestedInclude({'.a': {'b': 'x'}}, {'\\.a.b': 'y'});
+ * assert.notNestedInclude({'a': {'[b]': 'x'}}, {'a.\\[b\\]': 'y'});
+ *
+ * @name notNestedInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notNestedInclude = function (exp, inc, msg) {
+ new Assertion(exp, msg, assert.notNestedInclude, true)
+ .not.nested.include(inc);
+ };
+
+ /**
+ * ### .deepNestedInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' includes 'needle'.
+ * Can be used to assert the inclusion of a subset of properties in an
+ * object while checking for deep equality.
+ * Enables the use of dot- and bracket-notation for referencing nested
+ * properties.
+ * '[]' and '.' in property names can be escaped using double backslashes.
+ *
+ * assert.deepNestedInclude({a: {b: [{x: 1}]}}, {'a.b[0]': {x: 1}});
+ * assert.deepNestedInclude({'.a': {'[b]': {x: 1}}}, {'\\.a.\\[b\\]': {x: 1}});
+ *
+ * @name deepNestedInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.deepNestedInclude = function(exp, inc, msg) {
+ new Assertion(exp, msg, assert.deepNestedInclude, true)
+ .deep.nested.include(inc);
+ };
+
+ /**
+ * ### .notDeepNestedInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' does not include 'needle'.
+ * Can be used to assert the absence of a subset of properties in an
+ * object while checking for deep equality.
+ * Enables the use of dot- and bracket-notation for referencing nested
+ * properties.
+ * '[]' and '.' in property names can be escaped using double backslashes.
+ *
+ * assert.notDeepNestedInclude({a: {b: [{x: 1}]}}, {'a.b[0]': {y: 1}})
+ * assert.notDeepNestedInclude({'.a': {'[b]': {x: 1}}}, {'\\.a.\\[b\\]': {y: 2}});
+ *
+ * @name notDeepNestedInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notDeepNestedInclude = function(exp, inc, msg) {
+ new Assertion(exp, msg, assert.notDeepNestedInclude, true)
+ .not.deep.nested.include(inc);
+ };
+
+ /**
+ * ### .ownInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' includes 'needle'.
+ * Can be used to assert the inclusion of a subset of properties in an
+ * object while ignoring inherited properties.
+ *
+ * assert.ownInclude({ a: 1 }, { a: 1 });
+ *
+ * @name ownInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.ownInclude = function(exp, inc, msg) {
+ new Assertion(exp, msg, assert.ownInclude, true).own.include(inc);
+ };
+
+ /**
+ * ### .notOwnInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' includes 'needle'.
+ * Can be used to assert the absence of a subset of properties in an
+ * object while ignoring inherited properties.
+ *
+ * Object.prototype.b = 2;
+ *
+ * assert.notOwnInclude({ a: 1 }, { b: 2 });
+ *
+ * @name notOwnInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notOwnInclude = function(exp, inc, msg) {
+ new Assertion(exp, msg, assert.notOwnInclude, true).not.own.include(inc);
+ };
+
+ /**
+ * ### .deepOwnInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' includes 'needle'.
+ * Can be used to assert the inclusion of a subset of properties in an
+ * object while ignoring inherited properties and checking for deep equality.
+ *
+ * assert.deepOwnInclude({a: {b: 2}}, {a: {b: 2}});
+ *
+ * @name deepOwnInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.deepOwnInclude = function(exp, inc, msg) {
+ new Assertion(exp, msg, assert.deepOwnInclude, true)
+ .deep.own.include(inc);
+ };
+
+ /**
+ * ### .notDeepOwnInclude(haystack, needle, [message])
+ *
+ * Asserts that 'haystack' includes 'needle'.
+ * Can be used to assert the absence of a subset of properties in an
+ * object while ignoring inherited properties and checking for deep equality.
+ *
+ * assert.notDeepOwnInclude({a: {b: 2}}, {a: {c: 3}});
+ *
+ * @name notDeepOwnInclude
+ * @param {Object} haystack
+ * @param {Object} needle
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notDeepOwnInclude = function(exp, inc, msg) {
+ new Assertion(exp, msg, assert.notDeepOwnInclude, true)
+ .not.deep.own.include(inc);
+ };
+
+ /**
+ * ### .match(value, regexp, [message])
+ *
+ * Asserts that `value` matches the regular expression `regexp`.
+ *
+ * assert.match('foobar', /^foo/, 'regexp matches');
+ *
+ * @name match
+ * @param {Mixed} value
+ * @param {RegExp} regexp
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.match = function (exp, re, msg) {
+ new Assertion(exp, msg, assert.match, true).to.match(re);
+ };
+
+ /**
+ * ### .notMatch(value, regexp, [message])
+ *
+ * Asserts that `value` does not match the regular expression `regexp`.
+ *
+ * assert.notMatch('foobar', /^foo/, 'regexp does not match');
+ *
+ * @name notMatch
+ * @param {Mixed} value
+ * @param {RegExp} regexp
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notMatch = function (exp, re, msg) {
+ new Assertion(exp, msg, assert.notMatch, true).to.not.match(re);
+ };
+
+ /**
+ * ### .property(object, property, [message])
+ *
+ * Asserts that `object` has a direct or inherited property named by
+ * `property`.
+ *
+ * assert.property({ tea: { green: 'matcha' }}, 'tea');
+ * assert.property({ tea: { green: 'matcha' }}, 'toString');
+ *
+ * @name property
+ * @param {Object} object
+ * @param {String} property
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.property = function (obj, prop, msg) {
+ new Assertion(obj, msg, assert.property, true).to.have.property(prop);
+ };
+
+ /**
+ * ### .notProperty(object, property, [message])
+ *
+ * Asserts that `object` does _not_ have a direct or inherited property named
+ * by `property`.
+ *
+ * assert.notProperty({ tea: { green: 'matcha' }}, 'coffee');
+ *
+ * @name notProperty
+ * @param {Object} object
+ * @param {String} property
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notProperty = function (obj, prop, msg) {
+ new Assertion(obj, msg, assert.notProperty, true)
+ .to.not.have.property(prop);
+ };
+
+ /**
+ * ### .propertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` has a direct or inherited property named by
+ * `property` with a value given by `value`. Uses a strict equality check
+ * (===).
+ *
+ * assert.propertyVal({ tea: 'is good' }, 'tea', 'is good');
+ *
+ * @name propertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.propertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.propertyVal, true)
+ .to.have.property(prop, val);
+ };
+
+ /**
+ * ### .notPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` does _not_ have a direct or inherited property named
+ * by `property` with value given by `value`. Uses a strict equality check
+ * (===).
+ *
+ * assert.notPropertyVal({ tea: 'is good' }, 'tea', 'is bad');
+ * assert.notPropertyVal({ tea: 'is good' }, 'coffee', 'is good');
+ *
+ * @name notPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.notPropertyVal, true)
+ .to.not.have.property(prop, val);
+ };
+
+ /**
+ * ### .deepPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` has a direct or inherited property named by
+ * `property` with a value given by `value`. Uses a deep equality check.
+ *
+ * assert.deepPropertyVal({ tea: { green: 'matcha' } }, 'tea', { green: 'matcha' });
+ *
+ * @name deepPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.deepPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.deepPropertyVal, true)
+ .to.have.deep.property(prop, val);
+ };
+
+ /**
+ * ### .notDeepPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` does _not_ have a direct or inherited property named
+ * by `property` with value given by `value`. Uses a deep equality check.
+ *
+ * assert.notDeepPropertyVal({ tea: { green: 'matcha' } }, 'tea', { black: 'matcha' });
+ * assert.notDeepPropertyVal({ tea: { green: 'matcha' } }, 'tea', { green: 'oolong' });
+ * assert.notDeepPropertyVal({ tea: { green: 'matcha' } }, 'coffee', { green: 'matcha' });
+ *
+ * @name notDeepPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notDeepPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.notDeepPropertyVal, true)
+ .to.not.have.deep.property(prop, val);
+ };
+
+ /**
+ * ### .ownProperty(object, property, [message])
+ *
+ * Asserts that `object` has a direct property named by `property`. Inherited
+ * properties aren't checked.
+ *
+ * assert.ownProperty({ tea: { green: 'matcha' }}, 'tea');
+ *
+ * @name ownProperty
+ * @param {Object} object
+ * @param {String} property
+ * @param {String} message
+ * @api public
+ */
+
+ assert.ownProperty = function (obj, prop, msg) {
+ new Assertion(obj, msg, assert.ownProperty, true)
+ .to.have.own.property(prop);
+ };
+
+ /**
+ * ### .notOwnProperty(object, property, [message])
+ *
+ * Asserts that `object` does _not_ have a direct property named by
+ * `property`. Inherited properties aren't checked.
+ *
+ * assert.notOwnProperty({ tea: { green: 'matcha' }}, 'coffee');
+ * assert.notOwnProperty({}, 'toString');
+ *
+ * @name notOwnProperty
+ * @param {Object} object
+ * @param {String} property
+ * @param {String} message
+ * @api public
+ */
+
+ assert.notOwnProperty = function (obj, prop, msg) {
+ new Assertion(obj, msg, assert.notOwnProperty, true)
+ .to.not.have.own.property(prop);
+ };
+
+ /**
+ * ### .ownPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` has a direct property named by `property` and a value
+ * equal to the provided `value`. Uses a strict equality check (===).
+ * Inherited properties aren't checked.
+ *
+ * assert.ownPropertyVal({ coffee: 'is good'}, 'coffee', 'is good');
+ *
+ * @name ownPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @api public
+ */
+
+ assert.ownPropertyVal = function (obj, prop, value, msg) {
+ new Assertion(obj, msg, assert.ownPropertyVal, true)
+ .to.have.own.property(prop, value);
+ };
+
+ /**
+ * ### .notOwnPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` does _not_ have a direct property named by `property`
+ * with a value equal to the provided `value`. Uses a strict equality check
+ * (===). Inherited properties aren't checked.
+ *
+ * assert.notOwnPropertyVal({ tea: 'is better'}, 'tea', 'is worse');
+ * assert.notOwnPropertyVal({}, 'toString', Object.prototype.toString);
+ *
+ * @name notOwnPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @api public
+ */
+
+ assert.notOwnPropertyVal = function (obj, prop, value, msg) {
+ new Assertion(obj, msg, assert.notOwnPropertyVal, true)
+ .to.not.have.own.property(prop, value);
+ };
+
+ /**
+ * ### .deepOwnPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` has a direct property named by `property` and a value
+ * equal to the provided `value`. Uses a deep equality check. Inherited
+ * properties aren't checked.
+ *
+ * assert.deepOwnPropertyVal({ tea: { green: 'matcha' } }, 'tea', { green: 'matcha' });
+ *
+ * @name deepOwnPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @api public
+ */
+
+ assert.deepOwnPropertyVal = function (obj, prop, value, msg) {
+ new Assertion(obj, msg, assert.deepOwnPropertyVal, true)
+ .to.have.deep.own.property(prop, value);
+ };
+
+ /**
+ * ### .notDeepOwnPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` does _not_ have a direct property named by `property`
+ * with a value equal to the provided `value`. Uses a deep equality check.
+ * Inherited properties aren't checked.
+ *
+ * assert.notDeepOwnPropertyVal({ tea: { green: 'matcha' } }, 'tea', { black: 'matcha' });
+ * assert.notDeepOwnPropertyVal({ tea: { green: 'matcha' } }, 'tea', { green: 'oolong' });
+ * assert.notDeepOwnPropertyVal({ tea: { green: 'matcha' } }, 'coffee', { green: 'matcha' });
+ * assert.notDeepOwnPropertyVal({}, 'toString', Object.prototype.toString);
+ *
+ * @name notDeepOwnPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @api public
+ */
+
+ assert.notDeepOwnPropertyVal = function (obj, prop, value, msg) {
+ new Assertion(obj, msg, assert.notDeepOwnPropertyVal, true)
+ .to.not.have.deep.own.property(prop, value);
+ };
+
+ /**
+ * ### .nestedProperty(object, property, [message])
+ *
+ * Asserts that `object` has a direct or inherited property named by
+ * `property`, which can be a string using dot- and bracket-notation for
+ * nested reference.
+ *
+ * assert.nestedProperty({ tea: { green: 'matcha' }}, 'tea.green');
+ *
+ * @name nestedProperty
+ * @param {Object} object
+ * @param {String} property
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.nestedProperty = function (obj, prop, msg) {
+ new Assertion(obj, msg, assert.nestedProperty, true)
+ .to.have.nested.property(prop);
+ };
+
+ /**
+ * ### .notNestedProperty(object, property, [message])
+ *
+ * Asserts that `object` does _not_ have a property named by `property`, which
+ * can be a string using dot- and bracket-notation for nested reference. The
+ * property cannot exist on the object nor anywhere in its prototype chain.
+ *
+ * assert.notNestedProperty({ tea: { green: 'matcha' }}, 'tea.oolong');
+ *
+ * @name notNestedProperty
+ * @param {Object} object
+ * @param {String} property
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notNestedProperty = function (obj, prop, msg) {
+ new Assertion(obj, msg, assert.notNestedProperty, true)
+ .to.not.have.nested.property(prop);
+ };
+
+ /**
+ * ### .nestedPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` has a property named by `property` with value given
+ * by `value`. `property` can use dot- and bracket-notation for nested
+ * reference. Uses a strict equality check (===).
+ *
+ * assert.nestedPropertyVal({ tea: { green: 'matcha' }}, 'tea.green', 'matcha');
+ *
+ * @name nestedPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.nestedPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.nestedPropertyVal, true)
+ .to.have.nested.property(prop, val);
+ };
+
+ /**
+ * ### .notNestedPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` does _not_ have a property named by `property` with
+ * value given by `value`. `property` can use dot- and bracket-notation for
+ * nested reference. Uses a strict equality check (===).
+ *
+ * assert.notNestedPropertyVal({ tea: { green: 'matcha' }}, 'tea.green', 'konacha');
+ * assert.notNestedPropertyVal({ tea: { green: 'matcha' }}, 'coffee.green', 'matcha');
+ *
+ * @name notNestedPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notNestedPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.notNestedPropertyVal, true)
+ .to.not.have.nested.property(prop, val);
+ };
+
+ /**
+ * ### .deepNestedPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` has a property named by `property` with a value given
+ * by `value`. `property` can use dot- and bracket-notation for nested
+ * reference. Uses a deep equality check.
+ *
+ * assert.deepNestedPropertyVal({ tea: { green: { matcha: 'yum' } } }, 'tea.green', { matcha: 'yum' });
+ *
+ * @name deepNestedPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.deepNestedPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.deepNestedPropertyVal, true)
+ .to.have.deep.nested.property(prop, val);
+ };
+
+ /**
+ * ### .notDeepNestedPropertyVal(object, property, value, [message])
+ *
+ * Asserts that `object` does _not_ have a property named by `property` with
+ * value given by `value`. `property` can use dot- and bracket-notation for
+ * nested reference. Uses a deep equality check.
+ *
+ * assert.notDeepNestedPropertyVal({ tea: { green: { matcha: 'yum' } } }, 'tea.green', { oolong: 'yum' });
+ * assert.notDeepNestedPropertyVal({ tea: { green: { matcha: 'yum' } } }, 'tea.green', { matcha: 'yuck' });
+ * assert.notDeepNestedPropertyVal({ tea: { green: { matcha: 'yum' } } }, 'tea.black', { matcha: 'yum' });
+ *
+ * @name notDeepNestedPropertyVal
+ * @param {Object} object
+ * @param {String} property
+ * @param {Mixed} value
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notDeepNestedPropertyVal = function (obj, prop, val, msg) {
+ new Assertion(obj, msg, assert.notDeepNestedPropertyVal, true)
+ .to.not.have.deep.nested.property(prop, val);
+ }
+
+ /**
+ * ### .lengthOf(object, length, [message])
+ *
+ * Asserts that `object` has a `length` or `size` with the expected value.
+ *
+ * assert.lengthOf([1,2,3], 3, 'array has length of 3');
+ * assert.lengthOf('foobar', 6, 'string has length of 6');
+ * assert.lengthOf(new Set([1,2,3]), 3, 'set has size of 3');
+ * assert.lengthOf(new Map([['a',1],['b',2],['c',3]]), 3, 'map has size of 3');
+ *
+ * @name lengthOf
+ * @param {Mixed} object
+ * @param {Number} length
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.lengthOf = function (exp, len, msg) {
+ new Assertion(exp, msg, assert.lengthOf, true).to.have.lengthOf(len);
+ };
+
+ /**
+ * ### .hasAnyKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has at least one of the `keys` provided.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.hasAnyKeys({foo: 1, bar: 2, baz: 3}, ['foo', 'iDontExist', 'baz']);
+ * assert.hasAnyKeys({foo: 1, bar: 2, baz: 3}, {foo: 30, iDontExist: 99, baz: 1337});
+ * assert.hasAnyKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{foo: 1}, 'key']);
+ * assert.hasAnyKeys(new Set([{foo: 'bar'}, 'anotherKey']), [{foo: 'bar'}, 'anotherKey']);
+ *
+ * @name hasAnyKeys
+ * @param {Mixed} object
+ * @param {Array|Object} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.hasAnyKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.hasAnyKeys, true).to.have.any.keys(keys);
+ }
+
+ /**
+ * ### .hasAllKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has all and only all of the `keys` provided.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.hasAllKeys({foo: 1, bar: 2, baz: 3}, ['foo', 'bar', 'baz']);
+ * assert.hasAllKeys({foo: 1, bar: 2, baz: 3}, {foo: 30, bar: 99, baz: 1337]);
+ * assert.hasAllKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{foo: 1}, 'key']);
+ * assert.hasAllKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{foo: 'bar'}, 'anotherKey']);
+ *
+ * @name hasAllKeys
+ * @param {Mixed} object
+ * @param {String[]} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.hasAllKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.hasAllKeys, true).to.have.all.keys(keys);
+ }
+
+ /**
+ * ### .containsAllKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has all of the `keys` provided but may have more keys not listed.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.containsAllKeys({foo: 1, bar: 2, baz: 3}, ['foo', 'baz']);
+ * assert.containsAllKeys({foo: 1, bar: 2, baz: 3}, ['foo', 'bar', 'baz']);
+ * assert.containsAllKeys({foo: 1, bar: 2, baz: 3}, {foo: 30, baz: 1337});
+ * assert.containsAllKeys({foo: 1, bar: 2, baz: 3}, {foo: 30, bar: 99, baz: 1337});
+ * assert.containsAllKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{foo: 1}]);
+ * assert.containsAllKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{foo: 1}, 'key']);
+ * assert.containsAllKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{foo: 'bar'}]);
+ * assert.containsAllKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{foo: 'bar'}, 'anotherKey']);
+ *
+ * @name containsAllKeys
+ * @param {Mixed} object
+ * @param {String[]} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.containsAllKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.containsAllKeys, true)
+ .to.contain.all.keys(keys);
+ }
+
+ /**
+ * ### .doesNotHaveAnyKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has none of the `keys` provided.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.doesNotHaveAnyKeys({foo: 1, bar: 2, baz: 3}, ['one', 'two', 'example']);
+ * assert.doesNotHaveAnyKeys({foo: 1, bar: 2, baz: 3}, {one: 1, two: 2, example: 'foo'});
+ * assert.doesNotHaveAnyKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{one: 'two'}, 'example']);
+ * assert.doesNotHaveAnyKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{one: 'two'}, 'example']);
+ *
+ * @name doesNotHaveAnyKeys
+ * @param {Mixed} object
+ * @param {String[]} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotHaveAnyKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.doesNotHaveAnyKeys, true)
+ .to.not.have.any.keys(keys);
+ }
+
+ /**
+ * ### .doesNotHaveAllKeys(object, [keys], [message])
+ *
+ * Asserts that `object` does not have at least one of the `keys` provided.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.doesNotHaveAllKeys({foo: 1, bar: 2, baz: 3}, ['one', 'two', 'example']);
+ * assert.doesNotHaveAllKeys({foo: 1, bar: 2, baz: 3}, {one: 1, two: 2, example: 'foo'});
+ * assert.doesNotHaveAllKeys(new Map([[{foo: 1}, 'bar'], ['key', 'value']]), [{one: 'two'}, 'example']);
+ * assert.doesNotHaveAllKeys(new Set([{foo: 'bar'}, 'anotherKey'], [{one: 'two'}, 'example']);
+ *
+ * @name doesNotHaveAllKeys
+ * @param {Mixed} object
+ * @param {String[]} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotHaveAllKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.doesNotHaveAllKeys, true)
+ .to.not.have.all.keys(keys);
+ }
+
+ /**
+ * ### .hasAnyDeepKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has at least one of the `keys` provided.
+ * Since Sets and Maps can have objects as keys you can use this assertion to perform
+ * a deep comparison.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.hasAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), {one: 'one'});
+ * assert.hasAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), [{one: 'one'}, {two: 'two'}]);
+ * assert.hasAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{one: 'one'}, {two: 'two'}]);
+ * assert.hasAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), {one: 'one'});
+ * assert.hasAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {three: 'three'}]);
+ * assert.hasAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {two: 'two'}]);
+ *
+ * @name doesNotHaveAllKeys
+ * @param {Mixed} object
+ * @param {Array|Object} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.hasAnyDeepKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.hasAnyDeepKeys, true)
+ .to.have.any.deep.keys(keys);
+ }
+
+ /**
+ * ### .hasAllDeepKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has all and only all of the `keys` provided.
+ * Since Sets and Maps can have objects as keys you can use this assertion to perform
+ * a deep comparison.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.hasAllDeepKeys(new Map([[{one: 'one'}, 'valueOne']]), {one: 'one'});
+ * assert.hasAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{one: 'one'}, {two: 'two'}]);
+ * assert.hasAllDeepKeys(new Set([{one: 'one'}]), {one: 'one'});
+ * assert.hasAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {two: 'two'}]);
+ *
+ * @name hasAllDeepKeys
+ * @param {Mixed} object
+ * @param {Array|Object} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.hasAllDeepKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.hasAllDeepKeys, true)
+ .to.have.all.deep.keys(keys);
+ }
+
+ /**
+ * ### .containsAllDeepKeys(object, [keys], [message])
+ *
+ * Asserts that `object` contains all of the `keys` provided.
+ * Since Sets and Maps can have objects as keys you can use this assertion to perform
+ * a deep comparison.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.containsAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), {one: 'one'});
+ * assert.containsAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{one: 'one'}, {two: 'two'}]);
+ * assert.containsAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), {one: 'one'});
+ * assert.containsAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {two: 'two'}]);
+ *
+ * @name containsAllDeepKeys
+ * @param {Mixed} object
+ * @param {Array|Object} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.containsAllDeepKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.containsAllDeepKeys, true)
+ .to.contain.all.deep.keys(keys);
+ }
+
+ /**
+ * ### .doesNotHaveAnyDeepKeys(object, [keys], [message])
+ *
+ * Asserts that `object` has none of the `keys` provided.
+ * Since Sets and Maps can have objects as keys you can use this assertion to perform
+ * a deep comparison.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.doesNotHaveAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), {thisDoesNot: 'exist'});
+ * assert.doesNotHaveAnyDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{twenty: 'twenty'}, {fifty: 'fifty'}]);
+ * assert.doesNotHaveAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), {twenty: 'twenty'});
+ * assert.doesNotHaveAnyDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{twenty: 'twenty'}, {fifty: 'fifty'}]);
+ *
+ * @name doesNotHaveAnyDeepKeys
+ * @param {Mixed} object
+ * @param {Array|Object} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotHaveAnyDeepKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.doesNotHaveAnyDeepKeys, true)
+ .to.not.have.any.deep.keys(keys);
+ }
+
+ /**
+ * ### .doesNotHaveAllDeepKeys(object, [keys], [message])
+ *
+ * Asserts that `object` does not have at least one of the `keys` provided.
+ * Since Sets and Maps can have objects as keys you can use this assertion to perform
+ * a deep comparison.
+ * You can also provide a single object instead of a `keys` array and its keys
+ * will be used as the expected set of keys.
+ *
+ * assert.doesNotHaveAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [1, 2]]), {thisDoesNot: 'exist'});
+ * assert.doesNotHaveAllDeepKeys(new Map([[{one: 'one'}, 'valueOne'], [{two: 'two'}, 'valueTwo']]), [{twenty: 'twenty'}, {one: 'one'}]);
+ * assert.doesNotHaveAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), {twenty: 'twenty'});
+ * assert.doesNotHaveAllDeepKeys(new Set([{one: 'one'}, {two: 'two'}]), [{one: 'one'}, {fifty: 'fifty'}]);
+ *
+ * @name doesNotHaveAllDeepKeys
+ * @param {Mixed} object
+ * @param {Array|Object} keys
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotHaveAllDeepKeys = function (obj, keys, msg) {
+ new Assertion(obj, msg, assert.doesNotHaveAllDeepKeys, true)
+ .to.not.have.all.deep.keys(keys);
+ }
+
+ /**
+ * ### .throws(fn, [errorLike/string/regexp], [string/regexp], [message])
+ *
+ * If `errorLike` is an `Error` constructor, asserts that `fn` will throw an error that is an
+ * instance of `errorLike`.
+ * If `errorLike` is an `Error` instance, asserts that the error thrown is the same
+ * instance as `errorLike`.
+ * If `errMsgMatcher` is provided, it also asserts that the error thrown will have a
+ * message matching `errMsgMatcher`.
+ *
+ * assert.throws(fn, 'Error thrown must have this msg');
+ * assert.throws(fn, /Error thrown must have a msg that matches this/);
+ * assert.throws(fn, ReferenceError);
+ * assert.throws(fn, errorInstance);
+ * assert.throws(fn, ReferenceError, 'Error thrown must be a ReferenceError and have this msg');
+ * assert.throws(fn, errorInstance, 'Error thrown must be the same errorInstance and have this msg');
+ * assert.throws(fn, ReferenceError, /Error thrown must be a ReferenceError and match this/);
+ * assert.throws(fn, errorInstance, /Error thrown must be the same errorInstance and match this/);
+ *
+ * @name throws
+ * @alias throw
+ * @alias Throw
+ * @param {Function} fn
+ * @param {ErrorConstructor|Error} errorLike
+ * @param {RegExp|String} errMsgMatcher
+ * @param {String} message
+ * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.throws = function (fn, errorLike, errMsgMatcher, msg) {
+ if ('string' === typeof errorLike || errorLike instanceof RegExp) {
+ errMsgMatcher = errorLike;
+ errorLike = null;
+ }
+
+ var assertErr = new Assertion(fn, msg, assert.throws, true)
+ .to.throw(errorLike, errMsgMatcher);
+ return flag(assertErr, 'object');
+ };
+
+ /**
+ * ### .doesNotThrow(fn, [errorLike/string/regexp], [string/regexp], [message])
+ *
+ * If `errorLike` is an `Error` constructor, asserts that `fn` will _not_ throw an error that is an
+ * instance of `errorLike`.
+ * If `errorLike` is an `Error` instance, asserts that the error thrown is _not_ the same
+ * instance as `errorLike`.
+ * If `errMsgMatcher` is provided, it also asserts that the error thrown will _not_ have a
+ * message matching `errMsgMatcher`.
+ *
+ * assert.doesNotThrow(fn, 'Any Error thrown must not have this message');
+ * assert.doesNotThrow(fn, /Any Error thrown must not match this/);
+ * assert.doesNotThrow(fn, Error);
+ * assert.doesNotThrow(fn, errorInstance);
+ * assert.doesNotThrow(fn, Error, 'Error must not have this message');
+ * assert.doesNotThrow(fn, errorInstance, 'Error must not have this message');
+ * assert.doesNotThrow(fn, Error, /Error must not match this/);
+ * assert.doesNotThrow(fn, errorInstance, /Error must not match this/);
+ *
+ * @name doesNotThrow
+ * @param {Function} fn
+ * @param {ErrorConstructor} errorLike
+ * @param {RegExp|String} errMsgMatcher
+ * @param {String} message
+ * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotThrow = function (fn, errorLike, errMsgMatcher, msg) {
+ if ('string' === typeof errorLike || errorLike instanceof RegExp) {
+ errMsgMatcher = errorLike;
+ errorLike = null;
+ }
+
+ new Assertion(fn, msg, assert.doesNotThrow, true)
+ .to.not.throw(errorLike, errMsgMatcher);
+ };
+
+ /**
+ * ### .operator(val1, operator, val2, [message])
+ *
+ * Compares two values using `operator`.
+ *
+ * assert.operator(1, '<', 2, 'everything is ok');
+ * assert.operator(1, '>', 2, 'this will fail');
+ *
+ * @name operator
+ * @param {Mixed} val1
+ * @param {String} operator
+ * @param {Mixed} val2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.operator = function (val, operator, val2, msg) {
+ var ok;
+ switch(operator) {
+ case '==':
+ ok = val == val2;
+ break;
+ case '===':
+ ok = val === val2;
+ break;
+ case '>':
+ ok = val > val2;
+ break;
+ case '>=':
+ ok = val >= val2;
+ break;
+ case '<':
+ ok = val < val2;
+ break;
+ case '<=':
+ ok = val <= val2;
+ break;
+ case '!=':
+ ok = val != val2;
+ break;
+ case '!==':
+ ok = val !== val2;
+ break;
+ default:
+ msg = msg ? msg + ': ' : msg;
+ throw new chai.AssertionError(
+ msg + 'Invalid operator "' + operator + '"',
+ undefined,
+ assert.operator
+ );
+ }
+ var test = new Assertion(ok, msg, assert.operator, true);
+ test.assert(
+ true === flag(test, 'object')
+ , 'expected ' + util.inspect(val) + ' to be ' + operator + ' ' + util.inspect(val2)
+ , 'expected ' + util.inspect(val) + ' to not be ' + operator + ' ' + util.inspect(val2) );
+ };
+
+ /**
+ * ### .closeTo(actual, expected, delta, [message])
+ *
+ * Asserts that the target is equal `expected`, to within a +/- `delta` range.
+ *
+ * assert.closeTo(1.5, 1, 0.5, 'numbers are close');
+ *
+ * @name closeTo
+ * @param {Number} actual
+ * @param {Number} expected
+ * @param {Number} delta
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.closeTo = function (act, exp, delta, msg) {
+ new Assertion(act, msg, assert.closeTo, true).to.be.closeTo(exp, delta);
+ };
+
+ /**
+ * ### .approximately(actual, expected, delta, [message])
+ *
+ * Asserts that the target is equal `expected`, to within a +/- `delta` range.
+ *
+ * assert.approximately(1.5, 1, 0.5, 'numbers are close');
+ *
+ * @name approximately
+ * @param {Number} actual
+ * @param {Number} expected
+ * @param {Number} delta
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.approximately = function (act, exp, delta, msg) {
+ new Assertion(act, msg, assert.approximately, true)
+ .to.be.approximately(exp, delta);
+ };
+
+ /**
+ * ### .sameMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` have the same members in any order. Uses a
+ * strict equality check (===).
+ *
+ * assert.sameMembers([ 1, 2, 3 ], [ 2, 1, 3 ], 'same members');
+ *
+ * @name sameMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.sameMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.sameMembers, true)
+ .to.have.same.members(set2);
+ }
+
+ /**
+ * ### .notSameMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` don't have the same members in any order.
+ * Uses a strict equality check (===).
+ *
+ * assert.notSameMembers([ 1, 2, 3 ], [ 5, 1, 3 ], 'not same members');
+ *
+ * @name notSameMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notSameMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.notSameMembers, true)
+ .to.not.have.same.members(set2);
+ }
+
+ /**
+ * ### .sameDeepMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` have the same members in any order. Uses a
+ * deep equality check.
+ *
+ * assert.sameDeepMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [{ b: 2 }, { a: 1 }, { c: 3 }], 'same deep members');
+ *
+ * @name sameDeepMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.sameDeepMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.sameDeepMembers, true)
+ .to.have.same.deep.members(set2);
+ }
+
+ /**
+ * ### .notSameDeepMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` don't have the same members in any order.
+ * Uses a deep equality check.
+ *
+ * assert.notSameDeepMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [{ b: 2 }, { a: 1 }, { f: 5 }], 'not same deep members');
+ *
+ * @name notSameDeepMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notSameDeepMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.notSameDeepMembers, true)
+ .to.not.have.same.deep.members(set2);
+ }
+
+ /**
+ * ### .sameOrderedMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` have the same members in the same order.
+ * Uses a strict equality check (===).
+ *
+ * assert.sameOrderedMembers([ 1, 2, 3 ], [ 1, 2, 3 ], 'same ordered members');
+ *
+ * @name sameOrderedMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.sameOrderedMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.sameOrderedMembers, true)
+ .to.have.same.ordered.members(set2);
+ }
+
+ /**
+ * ### .notSameOrderedMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` don't have the same members in the same
+ * order. Uses a strict equality check (===).
+ *
+ * assert.notSameOrderedMembers([ 1, 2, 3 ], [ 2, 1, 3 ], 'not same ordered members');
+ *
+ * @name notSameOrderedMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notSameOrderedMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.notSameOrderedMembers, true)
+ .to.not.have.same.ordered.members(set2);
+ }
+
+ /**
+ * ### .sameDeepOrderedMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` have the same members in the same order.
+ * Uses a deep equality check.
+ *
+ * assert.sameDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { a: 1 }, { b: 2 }, { c: 3 } ], 'same deep ordered members');
+ *
+ * @name sameDeepOrderedMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.sameDeepOrderedMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.sameDeepOrderedMembers, true)
+ .to.have.same.deep.ordered.members(set2);
+ }
+
+ /**
+ * ### .notSameDeepOrderedMembers(set1, set2, [message])
+ *
+ * Asserts that `set1` and `set2` don't have the same members in the same
+ * order. Uses a deep equality check.
+ *
+ * assert.notSameDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { a: 1 }, { b: 2 }, { z: 5 } ], 'not same deep ordered members');
+ * assert.notSameDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { a: 1 }, { c: 3 } ], 'not same deep ordered members');
+ *
+ * @name notSameDeepOrderedMembers
+ * @param {Array} set1
+ * @param {Array} set2
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notSameDeepOrderedMembers = function (set1, set2, msg) {
+ new Assertion(set1, msg, assert.notSameDeepOrderedMembers, true)
+ .to.not.have.same.deep.ordered.members(set2);
+ }
+
+ /**
+ * ### .includeMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` is included in `superset` in any order. Uses a
+ * strict equality check (===). Duplicates are ignored.
+ *
+ * assert.includeMembers([ 1, 2, 3 ], [ 2, 1, 2 ], 'include members');
+ *
+ * @name includeMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.includeMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.includeMembers, true)
+ .to.include.members(subset);
+ }
+
+ /**
+ * ### .notIncludeMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` isn't included in `superset` in any order. Uses a
+ * strict equality check (===). Duplicates are ignored.
+ *
+ * assert.notIncludeMembers([ 1, 2, 3 ], [ 5, 1 ], 'not include members');
+ *
+ * @name notIncludeMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notIncludeMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.notIncludeMembers, true)
+ .to.not.include.members(subset);
+ }
+
+ /**
+ * ### .includeDeepMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` is included in `superset` in any order. Uses a deep
+ * equality check. Duplicates are ignored.
+ *
+ * assert.includeDeepMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { a: 1 }, { b: 2 } ], 'include deep members');
+ *
+ * @name includeDeepMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.includeDeepMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.includeDeepMembers, true)
+ .to.include.deep.members(subset);
+ }
+
+ /**
+ * ### .notIncludeDeepMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` isn't included in `superset` in any order. Uses a
+ * deep equality check. Duplicates are ignored.
+ *
+ * assert.notIncludeDeepMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { f: 5 } ], 'not include deep members');
+ *
+ * @name notIncludeDeepMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notIncludeDeepMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.notIncludeDeepMembers, true)
+ .to.not.include.deep.members(subset);
+ }
+
+ /**
+ * ### .includeOrderedMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` is included in `superset` in the same order
+ * beginning with the first element in `superset`. Uses a strict equality
+ * check (===).
+ *
+ * assert.includeOrderedMembers([ 1, 2, 3 ], [ 1, 2 ], 'include ordered members');
+ *
+ * @name includeOrderedMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.includeOrderedMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.includeOrderedMembers, true)
+ .to.include.ordered.members(subset);
+ }
+
+ /**
+ * ### .notIncludeOrderedMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` isn't included in `superset` in the same order
+ * beginning with the first element in `superset`. Uses a strict equality
+ * check (===).
+ *
+ * assert.notIncludeOrderedMembers([ 1, 2, 3 ], [ 2, 1 ], 'not include ordered members');
+ * assert.notIncludeOrderedMembers([ 1, 2, 3 ], [ 2, 3 ], 'not include ordered members');
+ *
+ * @name notIncludeOrderedMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notIncludeOrderedMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.notIncludeOrderedMembers, true)
+ .to.not.include.ordered.members(subset);
+ }
+
+ /**
+ * ### .includeDeepOrderedMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` is included in `superset` in the same order
+ * beginning with the first element in `superset`. Uses a deep equality
+ * check.
+ *
+ * assert.includeDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { a: 1 }, { b: 2 } ], 'include deep ordered members');
+ *
+ * @name includeDeepOrderedMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.includeDeepOrderedMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.includeDeepOrderedMembers, true)
+ .to.include.deep.ordered.members(subset);
+ }
+
+ /**
+ * ### .notIncludeDeepOrderedMembers(superset, subset, [message])
+ *
+ * Asserts that `subset` isn't included in `superset` in the same order
+ * beginning with the first element in `superset`. Uses a deep equality
+ * check.
+ *
+ * assert.notIncludeDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { a: 1 }, { f: 5 } ], 'not include deep ordered members');
+ * assert.notIncludeDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { a: 1 } ], 'not include deep ordered members');
+ * assert.notIncludeDeepOrderedMembers([ { a: 1 }, { b: 2 }, { c: 3 } ], [ { b: 2 }, { c: 3 } ], 'not include deep ordered members');
+ *
+ * @name notIncludeDeepOrderedMembers
+ * @param {Array} superset
+ * @param {Array} subset
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.notIncludeDeepOrderedMembers = function (superset, subset, msg) {
+ new Assertion(superset, msg, assert.notIncludeDeepOrderedMembers, true)
+ .to.not.include.deep.ordered.members(subset);
+ }
+
+ /**
+ * ### .oneOf(inList, list, [message])
+ *
+ * Asserts that non-object, non-array value `inList` appears in the flat array `list`.
+ *
+ * assert.oneOf(1, [ 2, 1 ], 'Not found in list');
+ *
+ * @name oneOf
+ * @param {*} inList
+ * @param {Array<*>} list
+ * @param {String} message
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.oneOf = function (inList, list, msg) {
+ new Assertion(inList, msg, assert.oneOf, true).to.be.oneOf(list);
+ }
+
+ /**
+ * ### .changes(function, object, property, [message])
+ *
+ * Asserts that a function changes the value of a property.
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 22 };
+ * assert.changes(fn, obj, 'val');
+ *
+ * @name changes
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.changes = function (fn, obj, prop, msg) {
+ if (arguments.length === 3 && typeof obj === 'function') {
+ msg = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.changes, true).to.change(obj, prop);
+ }
+
+ /**
+ * ### .changesBy(function, object, property, delta, [message])
+ *
+ * Asserts that a function changes the value of a property by an amount (delta).
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val += 2 };
+ * assert.changesBy(fn, obj, 'val', 2);
+ *
+ * @name changesBy
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.changesBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.changesBy, true)
+ .to.change(obj, prop).by(delta);
+ }
+
+ /**
+ * ### .doesNotChange(function, object, property, [message])
+ *
+ * Asserts that a function does not change the value of a property.
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { console.log('foo'); };
+ * assert.doesNotChange(fn, obj, 'val');
+ *
+ * @name doesNotChange
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotChange = function (fn, obj, prop, msg) {
+ if (arguments.length === 3 && typeof obj === 'function') {
+ msg = prop;
+ prop = null;
+ }
+
+ return new Assertion(fn, msg, assert.doesNotChange, true)
+ .to.not.change(obj, prop);
+ }
+
+ /**
+ * ### .changesButNotBy(function, object, property, delta, [message])
+ *
+ * Asserts that a function does not change the value of a property or of a function's return value by an amount (delta)
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val += 10 };
+ * assert.changesButNotBy(fn, obj, 'val', 5);
+ *
+ * @name changesButNotBy
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.changesButNotBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.changesButNotBy, true)
+ .to.change(obj, prop).but.not.by(delta);
+ }
+
+ /**
+ * ### .increases(function, object, property, [message])
+ *
+ * Asserts that a function increases a numeric object property.
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 13 };
+ * assert.increases(fn, obj, 'val');
+ *
+ * @name increases
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.increases = function (fn, obj, prop, msg) {
+ if (arguments.length === 3 && typeof obj === 'function') {
+ msg = prop;
+ prop = null;
+ }
+
+ return new Assertion(fn, msg, assert.increases, true)
+ .to.increase(obj, prop);
+ }
+
+ /**
+ * ### .increasesBy(function, object, property, delta, [message])
+ *
+ * Asserts that a function increases a numeric object property or a function's return value by an amount (delta).
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val += 10 };
+ * assert.increasesBy(fn, obj, 'val', 10);
+ *
+ * @name increasesBy
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.increasesBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.increasesBy, true)
+ .to.increase(obj, prop).by(delta);
+ }
+
+ /**
+ * ### .doesNotIncrease(function, object, property, [message])
+ *
+ * Asserts that a function does not increase a numeric object property.
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 8 };
+ * assert.doesNotIncrease(fn, obj, 'val');
+ *
+ * @name doesNotIncrease
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotIncrease = function (fn, obj, prop, msg) {
+ if (arguments.length === 3 && typeof obj === 'function') {
+ msg = prop;
+ prop = null;
+ }
+
+ return new Assertion(fn, msg, assert.doesNotIncrease, true)
+ .to.not.increase(obj, prop);
+ }
+
+ /**
+ * ### .increasesButNotBy(function, object, property, [message])
+ *
+ * Asserts that a function does not increase a numeric object property or function's return value by an amount (delta).
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 15 };
+ * assert.increasesButNotBy(fn, obj, 'val', 10);
+ *
+ * @name increasesButNotBy
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.increasesButNotBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.increasesButNotBy, true)
+ .to.increase(obj, prop).but.not.by(delta);
+ }
+
+ /**
+ * ### .decreases(function, object, property, [message])
+ *
+ * Asserts that a function decreases a numeric object property.
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 5 };
+ * assert.decreases(fn, obj, 'val');
+ *
+ * @name decreases
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.decreases = function (fn, obj, prop, msg) {
+ if (arguments.length === 3 && typeof obj === 'function') {
+ msg = prop;
+ prop = null;
+ }
+
+ return new Assertion(fn, msg, assert.decreases, true)
+ .to.decrease(obj, prop);
+ }
+
+ /**
+ * ### .decreasesBy(function, object, property, delta, [message])
+ *
+ * Asserts that a function decreases a numeric object property or a function's return value by an amount (delta)
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val -= 5 };
+ * assert.decreasesBy(fn, obj, 'val', 5);
+ *
+ * @name decreasesBy
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.decreasesBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.decreasesBy, true)
+ .to.decrease(obj, prop).by(delta);
+ }
+
+ /**
+ * ### .doesNotDecrease(function, object, property, [message])
+ *
+ * Asserts that a function does not decreases a numeric object property.
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 15 };
+ * assert.doesNotDecrease(fn, obj, 'val');
+ *
+ * @name doesNotDecrease
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotDecrease = function (fn, obj, prop, msg) {
+ if (arguments.length === 3 && typeof obj === 'function') {
+ msg = prop;
+ prop = null;
+ }
+
+ return new Assertion(fn, msg, assert.doesNotDecrease, true)
+ .to.not.decrease(obj, prop);
+ }
+
+ /**
+ * ### .doesNotDecreaseBy(function, object, property, delta, [message])
+ *
+ * Asserts that a function does not decreases a numeric object property or a function's return value by an amount (delta)
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 5 };
+ * assert.doesNotDecreaseBy(fn, obj, 'val', 1);
+ *
+ * @name doesNotDecrease
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.doesNotDecreaseBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ return new Assertion(fn, msg, assert.doesNotDecreaseBy, true)
+ .to.not.decrease(obj, prop).by(delta);
+ }
+
+ /**
+ * ### .decreasesButNotBy(function, object, property, delta, [message])
+ *
+ * Asserts that a function does not decreases a numeric object property or a function's return value by an amount (delta)
+ *
+ * var obj = { val: 10 };
+ * var fn = function() { obj.val = 5 };
+ * assert.decreasesButNotBy(fn, obj, 'val', 1);
+ *
+ * @name decreasesButNotBy
+ * @param {Function} modifier function
+ * @param {Object} object or getter function
+ * @param {String} property name _optional_
+ * @param {Number} change amount (delta)
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.decreasesButNotBy = function (fn, obj, prop, delta, msg) {
+ if (arguments.length === 4 && typeof obj === 'function') {
+ var tmpMsg = delta;
+ delta = prop;
+ msg = tmpMsg;
+ } else if (arguments.length === 3) {
+ delta = prop;
+ prop = null;
+ }
+
+ new Assertion(fn, msg, assert.decreasesButNotBy, true)
+ .to.decrease(obj, prop).but.not.by(delta);
+ }
+
+ /*!
+ * ### .ifError(object)
+ *
+ * Asserts if value is not a false value, and throws if it is a true value.
+ * This is added to allow for chai to be a drop-in replacement for Node's
+ * assert class.
+ *
+ * var err = new Error('I am a custom error');
+ * assert.ifError(err); // Rethrows err!
+ *
+ * @name ifError
+ * @param {Object} object
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.ifError = function (val) {
+ if (val) {
+ throw(val);
+ }
+ };
+
+ /**
+ * ### .isExtensible(object)
+ *
+ * Asserts that `object` is extensible (can have new properties added to it).
+ *
+ * assert.isExtensible({});
+ *
+ * @name isExtensible
+ * @alias extensible
+ * @param {Object} object
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isExtensible = function (obj, msg) {
+ new Assertion(obj, msg, assert.isExtensible, true).to.be.extensible;
+ };
+
+ /**
+ * ### .isNotExtensible(object)
+ *
+ * Asserts that `object` is _not_ extensible.
+ *
+ * var nonExtensibleObject = Object.preventExtensions({});
+ * var sealedObject = Object.seal({});
+ * var frozenObject = Object.freeze({});
+ *
+ * assert.isNotExtensible(nonExtensibleObject);
+ * assert.isNotExtensible(sealedObject);
+ * assert.isNotExtensible(frozenObject);
+ *
+ * @name isNotExtensible
+ * @alias notExtensible
+ * @param {Object} object
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotExtensible = function (obj, msg) {
+ new Assertion(obj, msg, assert.isNotExtensible, true).to.not.be.extensible;
+ };
+
+ /**
+ * ### .isSealed(object)
+ *
+ * Asserts that `object` is sealed (cannot have new properties added to it
+ * and its existing properties cannot be removed).
+ *
+ * var sealedObject = Object.seal({});
+ * var frozenObject = Object.seal({});
+ *
+ * assert.isSealed(sealedObject);
+ * assert.isSealed(frozenObject);
+ *
+ * @name isSealed
+ * @alias sealed
+ * @param {Object} object
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isSealed = function (obj, msg) {
+ new Assertion(obj, msg, assert.isSealed, true).to.be.sealed;
+ };
+
+ /**
+ * ### .isNotSealed(object)
+ *
+ * Asserts that `object` is _not_ sealed.
+ *
+ * assert.isNotSealed({});
+ *
+ * @name isNotSealed
+ * @alias notSealed
+ * @param {Object} object
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotSealed = function (obj, msg) {
+ new Assertion(obj, msg, assert.isNotSealed, true).to.not.be.sealed;
+ };
+
+ /**
+ * ### .isFrozen(object)
+ *
+ * Asserts that `object` is frozen (cannot have new properties added to it
+ * and its existing properties cannot be modified).
+ *
+ * var frozenObject = Object.freeze({});
+ * assert.frozen(frozenObject);
+ *
+ * @name isFrozen
+ * @alias frozen
+ * @param {Object} object
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isFrozen = function (obj, msg) {
+ new Assertion(obj, msg, assert.isFrozen, true).to.be.frozen;
+ };
+
+ /**
+ * ### .isNotFrozen(object)
+ *
+ * Asserts that `object` is _not_ frozen.
+ *
+ * assert.isNotFrozen({});
+ *
+ * @name isNotFrozen
+ * @alias notFrozen
+ * @param {Object} object
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotFrozen = function (obj, msg) {
+ new Assertion(obj, msg, assert.isNotFrozen, true).to.not.be.frozen;
+ };
+
+ /**
+ * ### .isEmpty(target)
+ *
+ * Asserts that the target does not contain any values.
+ * For arrays and strings, it checks the `length` property.
+ * For `Map` and `Set` instances, it checks the `size` property.
+ * For non-function objects, it gets the count of own
+ * enumerable string keys.
+ *
+ * assert.isEmpty([]);
+ * assert.isEmpty('');
+ * assert.isEmpty(new Map);
+ * assert.isEmpty({});
+ *
+ * @name isEmpty
+ * @alias empty
+ * @param {Object|Array|String|Map|Set} target
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isEmpty = function(val, msg) {
+ new Assertion(val, msg, assert.isEmpty, true).to.be.empty;
+ };
+
+ /**
+ * ### .isNotEmpty(target)
+ *
+ * Asserts that the target contains values.
+ * For arrays and strings, it checks the `length` property.
+ * For `Map` and `Set` instances, it checks the `size` property.
+ * For non-function objects, it gets the count of own
+ * enumerable string keys.
+ *
+ * assert.isNotEmpty([1, 2]);
+ * assert.isNotEmpty('34');
+ * assert.isNotEmpty(new Set([5, 6]));
+ * assert.isNotEmpty({ key: 7 });
+ *
+ * @name isNotEmpty
+ * @alias notEmpty
+ * @param {Object|Array|String|Map|Set} target
+ * @param {String} message _optional_
+ * @namespace Assert
+ * @api public
+ */
+
+ assert.isNotEmpty = function(val, msg) {
+ new Assertion(val, msg, assert.isNotEmpty, true).to.not.be.empty;
+ };
+
+ /*!
+ * Aliases.
+ */
+
+ (function alias(name, as){
+ assert[as] = assert[name];
+ return alias;
+ })
+ ('isOk', 'ok')
+ ('isNotOk', 'notOk')
+ ('throws', 'throw')
+ ('throws', 'Throw')
+ ('isExtensible', 'extensible')
+ ('isNotExtensible', 'notExtensible')
+ ('isSealed', 'sealed')
+ ('isNotSealed', 'notSealed')
+ ('isFrozen', 'frozen')
+ ('isNotFrozen', 'notFrozen')
+ ('isEmpty', 'empty')
+ ('isNotEmpty', 'notEmpty');
+};
+
+},{}],7:[function(require,module,exports){
+/*!
+ * chai
+ * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+module.exports = function (chai, util) {
+ chai.expect = function (val, message) {
+ return new chai.Assertion(val, message);
+ };
+
+ /**
+ * ### .fail([message])
+ * ### .fail(actual, expected, [message], [operator])
+ *
+ * Throw a failure.
+ *
+ * expect.fail();
+ * expect.fail("custom error message");
+ * expect.fail(1, 2);
+ * expect.fail(1, 2, "custom error message");
+ * expect.fail(1, 2, "custom error message", ">");
+ * expect.fail(1, 2, undefined, ">");
+ *
+ * @name fail
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @param {String} operator
+ * @namespace BDD
+ * @api public
+ */
+
+ chai.expect.fail = function (actual, expected, message, operator) {
+ if (arguments.length < 2) {
+ message = actual;
+ actual = undefined;
+ }
+
+ message = message || 'expect.fail()';
+ throw new chai.AssertionError(message, {
+ actual: actual
+ , expected: expected
+ , operator: operator
+ }, chai.expect.fail);
+ };
+};
+
+},{}],8:[function(require,module,exports){
+/*!
+ * chai
+ * Copyright(c) 2011-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+module.exports = function (chai, util) {
+ var Assertion = chai.Assertion;
+
+ function loadShould () {
+ // explicitly define this method as function as to have it's name to include as `ssfi`
+ function shouldGetter() {
+ if (this instanceof String
+ || this instanceof Number
+ || this instanceof Boolean
+ || typeof Symbol === 'function' && this instanceof Symbol) {
+ return new Assertion(this.valueOf(), null, shouldGetter);
+ }
+ return new Assertion(this, null, shouldGetter);
+ }
+ function shouldSetter(value) {
+ // See https://github.com/chaijs/chai/issues/86: this makes
+ // `whatever.should = someValue` actually set `someValue`, which is
+ // especially useful for `global.should = require('chai').should()`.
+ //
+ // Note that we have to use [[DefineProperty]] instead of [[Put]]
+ // since otherwise we would trigger this very setter!
+ Object.defineProperty(this, 'should', {
+ value: value,
+ enumerable: true,
+ configurable: true,
+ writable: true
+ });
+ }
+ // modify Object.prototype to have `should`
+ Object.defineProperty(Object.prototype, 'should', {
+ set: shouldSetter
+ , get: shouldGetter
+ , configurable: true
+ });
+
+ var should = {};
+
+ /**
+ * ### .fail([message])
+ * ### .fail(actual, expected, [message], [operator])
+ *
+ * Throw a failure.
+ *
+ * should.fail();
+ * should.fail("custom error message");
+ * should.fail(1, 2);
+ * should.fail(1, 2, "custom error message");
+ * should.fail(1, 2, "custom error message", ">");
+ * should.fail(1, 2, undefined, ">");
+ *
+ *
+ * @name fail
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @param {String} operator
+ * @namespace BDD
+ * @api public
+ */
+
+ should.fail = function (actual, expected, message, operator) {
+ if (arguments.length < 2) {
+ message = actual;
+ actual = undefined;
+ }
+
+ message = message || 'should.fail()';
+ throw new chai.AssertionError(message, {
+ actual: actual
+ , expected: expected
+ , operator: operator
+ }, should.fail);
+ };
+
+ /**
+ * ### .equal(actual, expected, [message])
+ *
+ * Asserts non-strict equality (`==`) of `actual` and `expected`.
+ *
+ * should.equal(3, '3', '== coerces values to strings');
+ *
+ * @name equal
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Should
+ * @api public
+ */
+
+ should.equal = function (val1, val2, msg) {
+ new Assertion(val1, msg).to.equal(val2);
+ };
+
+ /**
+ * ### .throw(function, [constructor/string/regexp], [string/regexp], [message])
+ *
+ * Asserts that `function` will throw an error that is an instance of
+ * `constructor`, or alternately that it will throw an error with message
+ * matching `regexp`.
+ *
+ * should.throw(fn, 'function throws a reference error');
+ * should.throw(fn, /function throws a reference error/);
+ * should.throw(fn, ReferenceError);
+ * should.throw(fn, ReferenceError, 'function throws a reference error');
+ * should.throw(fn, ReferenceError, /function throws a reference error/);
+ *
+ * @name throw
+ * @alias Throw
+ * @param {Function} function
+ * @param {ErrorConstructor} constructor
+ * @param {RegExp} regexp
+ * @param {String} message
+ * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+ * @namespace Should
+ * @api public
+ */
+
+ should.Throw = function (fn, errt, errs, msg) {
+ new Assertion(fn, msg).to.Throw(errt, errs);
+ };
+
+ /**
+ * ### .exist
+ *
+ * Asserts that the target is neither `null` nor `undefined`.
+ *
+ * var foo = 'hi';
+ *
+ * should.exist(foo, 'foo exists');
+ *
+ * @name exist
+ * @namespace Should
+ * @api public
+ */
+
+ should.exist = function (val, msg) {
+ new Assertion(val, msg).to.exist;
+ }
+
+ // negation
+ should.not = {}
+
+ /**
+ * ### .not.equal(actual, expected, [message])
+ *
+ * Asserts non-strict inequality (`!=`) of `actual` and `expected`.
+ *
+ * should.not.equal(3, 4, 'these numbers are not equal');
+ *
+ * @name not.equal
+ * @param {Mixed} actual
+ * @param {Mixed} expected
+ * @param {String} message
+ * @namespace Should
+ * @api public
+ */
+
+ should.not.equal = function (val1, val2, msg) {
+ new Assertion(val1, msg).to.not.equal(val2);
+ };
+
+ /**
+ * ### .throw(function, [constructor/regexp], [message])
+ *
+ * Asserts that `function` will _not_ throw an error that is an instance of
+ * `constructor`, or alternately that it will not throw an error with message
+ * matching `regexp`.
+ *
+ * should.not.throw(fn, Error, 'function does not throw');
+ *
+ * @name not.throw
+ * @alias not.Throw
+ * @param {Function} function
+ * @param {ErrorConstructor} constructor
+ * @param {RegExp} regexp
+ * @param {String} message
+ * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error#Error_types
+ * @namespace Should
+ * @api public
+ */
+
+ should.not.Throw = function (fn, errt, errs, msg) {
+ new Assertion(fn, msg).to.not.Throw(errt, errs);
+ };
+
+ /**
+ * ### .not.exist
+ *
+ * Asserts that the target is neither `null` nor `undefined`.
+ *
+ * var bar = null;
+ *
+ * should.not.exist(bar, 'bar does not exist');
+ *
+ * @name not.exist
+ * @namespace Should
+ * @api public
+ */
+
+ should.not.exist = function (val, msg) {
+ new Assertion(val, msg).to.not.exist;
+ }
+
+ should['throw'] = should['Throw'];
+ should.not['throw'] = should.not['Throw'];
+
+ return should;
+ };
+
+ chai.should = loadShould;
+ chai.Should = loadShould;
+};
+
+},{}],9:[function(require,module,exports){
+/*!
+ * Chai - addChainingMethod utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var addLengthGuard = require('./addLengthGuard');
+var chai = require('../../chai');
+var flag = require('./flag');
+var proxify = require('./proxify');
+var transferFlags = require('./transferFlags');
+
+/*!
+ * Module variables
+ */
+
+// Check whether `Object.setPrototypeOf` is supported
+var canSetPrototype = typeof Object.setPrototypeOf === 'function';
+
+// Without `Object.setPrototypeOf` support, this module will need to add properties to a function.
+// However, some of functions' own props are not configurable and should be skipped.
+var testFn = function() {};
+var excludeNames = Object.getOwnPropertyNames(testFn).filter(function(name) {
+ var propDesc = Object.getOwnPropertyDescriptor(testFn, name);
+
+ // Note: PhantomJS 1.x includes `callee` as one of `testFn`'s own properties,
+ // but then returns `undefined` as the property descriptor for `callee`. As a
+ // workaround, we perform an otherwise unnecessary type-check for `propDesc`,
+ // and then filter it out if it's not an object as it should be.
+ if (typeof propDesc !== 'object')
+ return true;
+
+ return !propDesc.configurable;
+});
+
+// Cache `Function` properties
+var call = Function.prototype.call,
+ apply = Function.prototype.apply;
+
+/**
+ * ### .addChainableMethod(ctx, name, method, chainingBehavior)
+ *
+ * Adds a method to an object, such that the method can also be chained.
+ *
+ * utils.addChainableMethod(chai.Assertion.prototype, 'foo', function (str) {
+ * var obj = utils.flag(this, 'object');
+ * new chai.Assertion(obj).to.be.equal(str);
+ * });
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ * chai.Assertion.addChainableMethod('foo', fn, chainingBehavior);
+ *
+ * The result can then be used as both a method assertion, executing both `method` and
+ * `chainingBehavior`, or as a language chain, which only executes `chainingBehavior`.
+ *
+ * expect(fooStr).to.be.foo('bar');
+ * expect(fooStr).to.be.foo.equal('foo');
+ *
+ * @param {Object} ctx object to which the method is added
+ * @param {String} name of method to add
+ * @param {Function} method function to be used for `name`, when called
+ * @param {Function} chainingBehavior function to be called every time the property is accessed
+ * @namespace Utils
+ * @name addChainableMethod
+ * @api public
+ */
+
+module.exports = function addChainableMethod(ctx, name, method, chainingBehavior) {
+ if (typeof chainingBehavior !== 'function') {
+ chainingBehavior = function () { };
+ }
+
+ var chainableBehavior = {
+ method: method
+ , chainingBehavior: chainingBehavior
+ };
+
+ // save the methods so we can overwrite them later, if we need to.
+ if (!ctx.__methods) {
+ ctx.__methods = {};
+ }
+ ctx.__methods[name] = chainableBehavior;
+
+ Object.defineProperty(ctx, name,
+ { get: function chainableMethodGetter() {
+ chainableBehavior.chainingBehavior.call(this);
+
+ var chainableMethodWrapper = function () {
+ // Setting the `ssfi` flag to `chainableMethodWrapper` causes this
+ // function to be the starting point for removing implementation
+ // frames from the stack trace of a failed assertion.
+ //
+ // However, we only want to use this function as the starting point if
+ // the `lockSsfi` flag isn't set.
+ //
+ // If the `lockSsfi` flag is set, then this assertion is being
+ // invoked from inside of another assertion. In this case, the `ssfi`
+ // flag has already been set by the outer assertion.
+ //
+ // Note that overwriting a chainable method merely replaces the saved
+ // methods in `ctx.__methods` instead of completely replacing the
+ // overwritten assertion. Therefore, an overwriting assertion won't
+ // set the `ssfi` or `lockSsfi` flags.
+ if (!flag(this, 'lockSsfi')) {
+ flag(this, 'ssfi', chainableMethodWrapper);
+ }
+
+ var result = chainableBehavior.method.apply(this, arguments);
+ if (result !== undefined) {
+ return result;
+ }
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ };
+
+ addLengthGuard(chainableMethodWrapper, name, true);
+
+ // Use `Object.setPrototypeOf` if available
+ if (canSetPrototype) {
+ // Inherit all properties from the object by replacing the `Function` prototype
+ var prototype = Object.create(this);
+ // Restore the `call` and `apply` methods from `Function`
+ prototype.call = call;
+ prototype.apply = apply;
+ Object.setPrototypeOf(chainableMethodWrapper, prototype);
+ }
+ // Otherwise, redefine all properties (slow!)
+ else {
+ var asserterNames = Object.getOwnPropertyNames(ctx);
+ asserterNames.forEach(function (asserterName) {
+ if (excludeNames.indexOf(asserterName) !== -1) {
+ return;
+ }
+
+ var pd = Object.getOwnPropertyDescriptor(ctx, asserterName);
+ Object.defineProperty(chainableMethodWrapper, asserterName, pd);
+ });
+ }
+
+ transferFlags(this, chainableMethodWrapper);
+ return proxify(chainableMethodWrapper);
+ }
+ , configurable: true
+ });
+};
+
+},{"../../chai":2,"./addLengthGuard":10,"./flag":15,"./proxify":30,"./transferFlags":32}],10:[function(require,module,exports){
+var fnLengthDesc = Object.getOwnPropertyDescriptor(function () {}, 'length');
+
+/*!
+ * Chai - addLengthGuard utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .addLengthGuard(fn, assertionName, isChainable)
+ *
+ * Define `length` as a getter on the given uninvoked method assertion. The
+ * getter acts as a guard against chaining `length` directly off of an uninvoked
+ * method assertion, which is a problem because it references `function`'s
+ * built-in `length` property instead of Chai's `length` assertion. When the
+ * getter catches the user making this mistake, it throws an error with a
+ * helpful message.
+ *
+ * There are two ways in which this mistake can be made. The first way is by
+ * chaining the `length` assertion directly off of an uninvoked chainable
+ * method. In this case, Chai suggests that the user use `lengthOf` instead. The
+ * second way is by chaining the `length` assertion directly off of an uninvoked
+ * non-chainable method. Non-chainable methods must be invoked prior to
+ * chaining. In this case, Chai suggests that the user consult the docs for the
+ * given assertion.
+ *
+ * If the `length` property of functions is unconfigurable, then return `fn`
+ * without modification.
+ *
+ * Note that in ES6, the function's `length` property is configurable, so once
+ * support for legacy environments is dropped, Chai's `length` property can
+ * replace the built-in function's `length` property, and this length guard will
+ * no longer be necessary. In the mean time, maintaining consistency across all
+ * environments is the priority.
+ *
+ * @param {Function} fn
+ * @param {String} assertionName
+ * @param {Boolean} isChainable
+ * @namespace Utils
+ * @name addLengthGuard
+ */
+
+module.exports = function addLengthGuard (fn, assertionName, isChainable) {
+ if (!fnLengthDesc.configurable) return fn;
+
+ Object.defineProperty(fn, 'length', {
+ get: function () {
+ if (isChainable) {
+ throw Error('Invalid Chai property: ' + assertionName + '.length. Due' +
+ ' to a compatibility issue, "length" cannot directly follow "' +
+ assertionName + '". Use "' + assertionName + '.lengthOf" instead.');
+ }
+
+ throw Error('Invalid Chai property: ' + assertionName + '.length. See' +
+ ' docs for proper usage of "' + assertionName + '".');
+ }
+ });
+
+ return fn;
+};
+
+},{}],11:[function(require,module,exports){
+/*!
+ * Chai - addMethod utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+var addLengthGuard = require('./addLengthGuard');
+var chai = require('../../chai');
+var flag = require('./flag');
+var proxify = require('./proxify');
+var transferFlags = require('./transferFlags');
+
+/**
+ * ### .addMethod(ctx, name, method)
+ *
+ * Adds a method to the prototype of an object.
+ *
+ * utils.addMethod(chai.Assertion.prototype, 'foo', function (str) {
+ * var obj = utils.flag(this, 'object');
+ * new chai.Assertion(obj).to.be.equal(str);
+ * });
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ * chai.Assertion.addMethod('foo', fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ * expect(fooStr).to.be.foo('bar');
+ *
+ * @param {Object} ctx object to which the method is added
+ * @param {String} name of method to add
+ * @param {Function} method function to be used for name
+ * @namespace Utils
+ * @name addMethod
+ * @api public
+ */
+
+module.exports = function addMethod(ctx, name, method) {
+ var methodWrapper = function () {
+ // Setting the `ssfi` flag to `methodWrapper` causes this function to be the
+ // starting point for removing implementation frames from the stack trace of
+ // a failed assertion.
+ //
+ // However, we only want to use this function as the starting point if the
+ // `lockSsfi` flag isn't set.
+ //
+ // If the `lockSsfi` flag is set, then either this assertion has been
+ // overwritten by another assertion, or this assertion is being invoked from
+ // inside of another assertion. In the first case, the `ssfi` flag has
+ // already been set by the overwriting assertion. In the second case, the
+ // `ssfi` flag has already been set by the outer assertion.
+ if (!flag(this, 'lockSsfi')) {
+ flag(this, 'ssfi', methodWrapper);
+ }
+
+ var result = method.apply(this, arguments);
+ if (result !== undefined)
+ return result;
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ };
+
+ addLengthGuard(methodWrapper, name, false);
+ ctx[name] = proxify(methodWrapper, name);
+};
+
+},{"../../chai":2,"./addLengthGuard":10,"./flag":15,"./proxify":30,"./transferFlags":32}],12:[function(require,module,exports){
+/*!
+ * Chai - addProperty utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+var chai = require('../../chai');
+var flag = require('./flag');
+var isProxyEnabled = require('./isProxyEnabled');
+var transferFlags = require('./transferFlags');
+
+/**
+ * ### .addProperty(ctx, name, getter)
+ *
+ * Adds a property to the prototype of an object.
+ *
+ * utils.addProperty(chai.Assertion.prototype, 'foo', function () {
+ * var obj = utils.flag(this, 'object');
+ * new chai.Assertion(obj).to.be.instanceof(Foo);
+ * });
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ * chai.Assertion.addProperty('foo', fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ * expect(myFoo).to.be.foo;
+ *
+ * @param {Object} ctx object to which the property is added
+ * @param {String} name of property to add
+ * @param {Function} getter function to be used for name
+ * @namespace Utils
+ * @name addProperty
+ * @api public
+ */
+
+module.exports = function addProperty(ctx, name, getter) {
+ getter = getter === undefined ? function () {} : getter;
+
+ Object.defineProperty(ctx, name,
+ { get: function propertyGetter() {
+ // Setting the `ssfi` flag to `propertyGetter` causes this function to
+ // be the starting point for removing implementation frames from the
+ // stack trace of a failed assertion.
+ //
+ // However, we only want to use this function as the starting point if
+ // the `lockSsfi` flag isn't set and proxy protection is disabled.
+ //
+ // If the `lockSsfi` flag is set, then either this assertion has been
+ // overwritten by another assertion, or this assertion is being invoked
+ // from inside of another assertion. In the first case, the `ssfi` flag
+ // has already been set by the overwriting assertion. In the second
+ // case, the `ssfi` flag has already been set by the outer assertion.
+ //
+ // If proxy protection is enabled, then the `ssfi` flag has already been
+ // set by the proxy getter.
+ if (!isProxyEnabled() && !flag(this, 'lockSsfi')) {
+ flag(this, 'ssfi', propertyGetter);
+ }
+
+ var result = getter.call(this);
+ if (result !== undefined)
+ return result;
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ }
+ , configurable: true
+ });
+};
+
+},{"../../chai":2,"./flag":15,"./isProxyEnabled":25,"./transferFlags":32}],13:[function(require,module,exports){
+/*!
+ * Chai - compareByInspect utility
+ * Copyright(c) 2011-2016 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var inspect = require('./inspect');
+
+/**
+ * ### .compareByInspect(mixed, mixed)
+ *
+ * To be used as a compareFunction with Array.prototype.sort. Compares elements
+ * using inspect instead of default behavior of using toString so that Symbols
+ * and objects with irregular/missing toString can still be sorted without a
+ * TypeError.
+ *
+ * @param {Mixed} first element to compare
+ * @param {Mixed} second element to compare
+ * @returns {Number} -1 if 'a' should come before 'b'; otherwise 1
+ * @name compareByInspect
+ * @namespace Utils
+ * @api public
+ */
+
+module.exports = function compareByInspect(a, b) {
+ return inspect(a) < inspect(b) ? -1 : 1;
+};
+
+},{"./inspect":23}],14:[function(require,module,exports){
+/*!
+ * Chai - expectTypes utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .expectTypes(obj, types)
+ *
+ * Ensures that the object being tested against is of a valid type.
+ *
+ * utils.expectTypes(this, ['array', 'object', 'string']);
+ *
+ * @param {Mixed} obj constructed Assertion
+ * @param {Array} type A list of allowed types for this assertion
+ * @namespace Utils
+ * @name expectTypes
+ * @api public
+ */
+
+var AssertionError = require('assertion-error');
+var flag = require('./flag');
+var type = require('type-detect');
+
+module.exports = function expectTypes(obj, types) {
+ var flagMsg = flag(obj, 'message');
+ var ssfi = flag(obj, 'ssfi');
+
+ flagMsg = flagMsg ? flagMsg + ': ' : '';
+
+ obj = flag(obj, 'object');
+ types = types.map(function (t) { return t.toLowerCase(); });
+ types.sort();
+
+ // Transforms ['lorem', 'ipsum'] into 'a lorem, or an ipsum'
+ var str = types.map(function (t, index) {
+ var art = ~[ 'a', 'e', 'i', 'o', 'u' ].indexOf(t.charAt(0)) ? 'an' : 'a';
+ var or = types.length > 1 && index === types.length - 1 ? 'or ' : '';
+ return or + art + ' ' + t;
+ }).join(', ');
+
+ var objType = type(obj).toLowerCase();
+
+ if (!types.some(function (expected) { return objType === expected; })) {
+ throw new AssertionError(
+ flagMsg + 'object tested must be ' + str + ', but ' + objType + ' given',
+ undefined,
+ ssfi
+ );
+ }
+};
+
+},{"./flag":15,"assertion-error":33,"type-detect":38}],15:[function(require,module,exports){
+/*!
+ * Chai - flag utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .flag(object, key, [value])
+ *
+ * Get or set a flag value on an object. If a
+ * value is provided it will be set, else it will
+ * return the currently set value or `undefined` if
+ * the value is not set.
+ *
+ * utils.flag(this, 'foo', 'bar'); // setter
+ * utils.flag(this, 'foo'); // getter, returns `bar`
+ *
+ * @param {Object} object constructed Assertion
+ * @param {String} key
+ * @param {Mixed} value (optional)
+ * @namespace Utils
+ * @name flag
+ * @api private
+ */
+
+module.exports = function flag(obj, key, value) {
+ var flags = obj.__flags || (obj.__flags = Object.create(null));
+ if (arguments.length === 3) {
+ flags[key] = value;
+ } else {
+ return flags[key];
+ }
+};
+
+},{}],16:[function(require,module,exports){
+/*!
+ * Chai - getActual utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .getActual(object, [actual])
+ *
+ * Returns the `actual` value for an Assertion.
+ *
+ * @param {Object} object (constructed Assertion)
+ * @param {Arguments} chai.Assertion.prototype.assert arguments
+ * @namespace Utils
+ * @name getActual
+ */
+
+module.exports = function getActual(obj, args) {
+ return args.length > 4 ? args[4] : obj._obj;
+};
+
+},{}],17:[function(require,module,exports){
+/*!
+ * Chai - getEnumerableProperties utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .getEnumerableProperties(object)
+ *
+ * This allows the retrieval of enumerable property names of an object,
+ * inherited or not.
+ *
+ * @param {Object} object
+ * @returns {Array}
+ * @namespace Utils
+ * @name getEnumerableProperties
+ * @api public
+ */
+
+module.exports = function getEnumerableProperties(object) {
+ var result = [];
+ for (var name in object) {
+ result.push(name);
+ }
+ return result;
+};
+
+},{}],18:[function(require,module,exports){
+/*!
+ * Chai - message composition utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var flag = require('./flag')
+ , getActual = require('./getActual')
+ , objDisplay = require('./objDisplay');
+
+/**
+ * ### .getMessage(object, message, negateMessage)
+ *
+ * Construct the error message based on flags
+ * and template tags. Template tags will return
+ * a stringified inspection of the object referenced.
+ *
+ * Message template tags:
+ * - `#{this}` current asserted object
+ * - `#{act}` actual value
+ * - `#{exp}` expected value
+ *
+ * @param {Object} object (constructed Assertion)
+ * @param {Arguments} chai.Assertion.prototype.assert arguments
+ * @namespace Utils
+ * @name getMessage
+ * @api public
+ */
+
+module.exports = function getMessage(obj, args) {
+ var negate = flag(obj, 'negate')
+ , val = flag(obj, 'object')
+ , expected = args[3]
+ , actual = getActual(obj, args)
+ , msg = negate ? args[2] : args[1]
+ , flagMsg = flag(obj, 'message');
+
+ if(typeof msg === "function") msg = msg();
+ msg = msg || '';
+ msg = msg
+ .replace(/#\{this\}/g, function () { return objDisplay(val); })
+ .replace(/#\{act\}/g, function () { return objDisplay(actual); })
+ .replace(/#\{exp\}/g, function () { return objDisplay(expected); });
+
+ return flagMsg ? flagMsg + ': ' + msg : msg;
+};
+
+},{"./flag":15,"./getActual":16,"./objDisplay":26}],19:[function(require,module,exports){
+/*!
+ * Chai - getOwnEnumerableProperties utility
+ * Copyright(c) 2011-2016 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var getOwnEnumerablePropertySymbols = require('./getOwnEnumerablePropertySymbols');
+
+/**
+ * ### .getOwnEnumerableProperties(object)
+ *
+ * This allows the retrieval of directly-owned enumerable property names and
+ * symbols of an object. This function is necessary because Object.keys only
+ * returns enumerable property names, not enumerable property symbols.
+ *
+ * @param {Object} object
+ * @returns {Array}
+ * @namespace Utils
+ * @name getOwnEnumerableProperties
+ * @api public
+ */
+
+module.exports = function getOwnEnumerableProperties(obj) {
+ return Object.keys(obj).concat(getOwnEnumerablePropertySymbols(obj));
+};
+
+},{"./getOwnEnumerablePropertySymbols":20}],20:[function(require,module,exports){
+/*!
+ * Chai - getOwnEnumerablePropertySymbols utility
+ * Copyright(c) 2011-2016 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .getOwnEnumerablePropertySymbols(object)
+ *
+ * This allows the retrieval of directly-owned enumerable property symbols of an
+ * object. This function is necessary because Object.getOwnPropertySymbols
+ * returns both enumerable and non-enumerable property symbols.
+ *
+ * @param {Object} object
+ * @returns {Array}
+ * @namespace Utils
+ * @name getOwnEnumerablePropertySymbols
+ * @api public
+ */
+
+module.exports = function getOwnEnumerablePropertySymbols(obj) {
+ if (typeof Object.getOwnPropertySymbols !== 'function') return [];
+
+ return Object.getOwnPropertySymbols(obj).filter(function (sym) {
+ return Object.getOwnPropertyDescriptor(obj, sym).enumerable;
+ });
+};
+
+},{}],21:[function(require,module,exports){
+/*!
+ * Chai - getProperties utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .getProperties(object)
+ *
+ * This allows the retrieval of property names of an object, enumerable or not,
+ * inherited or not.
+ *
+ * @param {Object} object
+ * @returns {Array}
+ * @namespace Utils
+ * @name getProperties
+ * @api public
+ */
+
+module.exports = function getProperties(object) {
+ var result = Object.getOwnPropertyNames(object);
+
+ function addProperty(property) {
+ if (result.indexOf(property) === -1) {
+ result.push(property);
+ }
+ }
+
+ var proto = Object.getPrototypeOf(object);
+ while (proto !== null) {
+ Object.getOwnPropertyNames(proto).forEach(addProperty);
+ proto = Object.getPrototypeOf(proto);
+ }
+
+ return result;
+};
+
+},{}],22:[function(require,module,exports){
+/*!
+ * chai
+ * Copyright(c) 2011 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/*!
+ * Dependencies that are used for multiple exports are required here only once
+ */
+
+var pathval = require('pathval');
+
+/*!
+ * test utility
+ */
+
+exports.test = require('./test');
+
+/*!
+ * type utility
+ */
+
+exports.type = require('type-detect');
+
+/*!
+ * expectTypes utility
+ */
+exports.expectTypes = require('./expectTypes');
+
+/*!
+ * message utility
+ */
+
+exports.getMessage = require('./getMessage');
+
+/*!
+ * actual utility
+ */
+
+exports.getActual = require('./getActual');
+
+/*!
+ * Inspect util
+ */
+
+exports.inspect = require('./inspect');
+
+/*!
+ * Object Display util
+ */
+
+exports.objDisplay = require('./objDisplay');
+
+/*!
+ * Flag utility
+ */
+
+exports.flag = require('./flag');
+
+/*!
+ * Flag transferring utility
+ */
+
+exports.transferFlags = require('./transferFlags');
+
+/*!
+ * Deep equal utility
+ */
+
+exports.eql = require('deep-eql');
+
+/*!
+ * Deep path info
+ */
+
+exports.getPathInfo = pathval.getPathInfo;
+
+/*!
+ * Check if a property exists
+ */
+
+exports.hasProperty = pathval.hasProperty;
+
+/*!
+ * Function name
+ */
+
+exports.getName = require('get-func-name');
+
+/*!
+ * add Property
+ */
+
+exports.addProperty = require('./addProperty');
+
+/*!
+ * add Method
+ */
+
+exports.addMethod = require('./addMethod');
+
+/*!
+ * overwrite Property
+ */
+
+exports.overwriteProperty = require('./overwriteProperty');
+
+/*!
+ * overwrite Method
+ */
+
+exports.overwriteMethod = require('./overwriteMethod');
+
+/*!
+ * Add a chainable method
+ */
+
+exports.addChainableMethod = require('./addChainableMethod');
+
+/*!
+ * Overwrite chainable method
+ */
+
+exports.overwriteChainableMethod = require('./overwriteChainableMethod');
+
+/*!
+ * Compare by inspect method
+ */
+
+exports.compareByInspect = require('./compareByInspect');
+
+/*!
+ * Get own enumerable property symbols method
+ */
+
+exports.getOwnEnumerablePropertySymbols = require('./getOwnEnumerablePropertySymbols');
+
+/*!
+ * Get own enumerable properties method
+ */
+
+exports.getOwnEnumerableProperties = require('./getOwnEnumerableProperties');
+
+/*!
+ * Checks error against a given set of criteria
+ */
+
+exports.checkError = require('check-error');
+
+/*!
+ * Proxify util
+ */
+
+exports.proxify = require('./proxify');
+
+/*!
+ * addLengthGuard util
+ */
+
+exports.addLengthGuard = require('./addLengthGuard');
+
+/*!
+ * isProxyEnabled helper
+ */
+
+exports.isProxyEnabled = require('./isProxyEnabled');
+
+/*!
+ * isNaN method
+ */
+
+exports.isNaN = require('./isNaN');
+
+},{"./addChainableMethod":9,"./addLengthGuard":10,"./addMethod":11,"./addProperty":12,"./compareByInspect":13,"./expectTypes":14,"./flag":15,"./getActual":16,"./getMessage":18,"./getOwnEnumerableProperties":19,"./getOwnEnumerablePropertySymbols":20,"./inspect":23,"./isNaN":24,"./isProxyEnabled":25,"./objDisplay":26,"./overwriteChainableMethod":27,"./overwriteMethod":28,"./overwriteProperty":29,"./proxify":30,"./test":31,"./transferFlags":32,"check-error":34,"deep-eql":35,"get-func-name":36,"pathval":37,"type-detect":38}],23:[function(require,module,exports){
+// This is (almost) directly from Node.js utils
+// https://github.com/joyent/node/blob/f8c335d0caf47f16d31413f89aa28eda3878e3aa/lib/util.js
+
+var getName = require('get-func-name');
+var getProperties = require('./getProperties');
+var getEnumerableProperties = require('./getEnumerableProperties');
+var config = require('../config');
+
+module.exports = inspect;
+
+/**
+ * ### .inspect(obj, [showHidden], [depth], [colors])
+ *
+ * Echoes the value of a value. Tries to print the value out
+ * in the best way possible given the different types.
+ *
+ * @param {Object} obj The object to print out.
+ * @param {Boolean} showHidden Flag that shows hidden (not enumerable)
+ * properties of objects. Default is false.
+ * @param {Number} depth Depth in which to descend in object. Default is 2.
+ * @param {Boolean} colors Flag to turn on ANSI escape codes to color the
+ * output. Default is false (no coloring).
+ * @namespace Utils
+ * @name inspect
+ */
+function inspect(obj, showHidden, depth, colors) {
+ var ctx = {
+ showHidden: showHidden,
+ seen: [],
+ stylize: function (str) { return str; }
+ };
+ return formatValue(ctx, obj, (typeof depth === 'undefined' ? 2 : depth));
+}
+
+// Returns true if object is a DOM element.
+var isDOMElement = function (object) {
+ if (typeof HTMLElement === 'object') {
+ return object instanceof HTMLElement;
+ } else {
+ return object &&
+ typeof object === 'object' &&
+ 'nodeType' in object &&
+ object.nodeType === 1 &&
+ typeof object.nodeName === 'string';
+ }
+};
+
+function formatValue(ctx, value, recurseTimes) {
+ // Provide a hook for user-specified inspect functions.
+ // Check that value is an object with an inspect function on it
+ if (value && typeof value.inspect === 'function' &&
+ // Filter out the util module, it's inspect function is special
+ value.inspect !== exports.inspect &&
+ // Also filter out any prototype objects using the circular check.
+ !(value.constructor && value.constructor.prototype === value)) {
+ var ret = value.inspect(recurseTimes, ctx);
+ if (typeof ret !== 'string') {
+ ret = formatValue(ctx, ret, recurseTimes);
+ }
+ return ret;
+ }
+
+ // Primitive types cannot have properties
+ var primitive = formatPrimitive(ctx, value);
+ if (primitive) {
+ return primitive;
+ }
+
+ // If this is a DOM element, try to get the outer HTML.
+ if (isDOMElement(value)) {
+ if ('outerHTML' in value) {
+ return value.outerHTML;
+ // This value does not have an outerHTML attribute,
+ // it could still be an XML element
+ } else {
+ // Attempt to serialize it
+ try {
+ if (document.xmlVersion) {
+ var xmlSerializer = new XMLSerializer();
+ return xmlSerializer.serializeToString(value);
+ } else {
+ // Firefox 11- do not support outerHTML
+ // It does, however, support innerHTML
+ // Use the following to render the element
+ var ns = "http://www.w3.org/1999/xhtml";
+ var container = document.createElementNS(ns, '_');
+
+ container.appendChild(value.cloneNode(false));
+ var html = container.innerHTML
+ .replace('><', '>' + value.innerHTML + '<');
+ container.innerHTML = '';
+ return html;
+ }
+ } catch (err) {
+ // This could be a non-native DOM implementation,
+ // continue with the normal flow:
+ // printing the element as if it is an object.
+ }
+ }
+ }
+
+ // Look up the keys of the object.
+ var visibleKeys = getEnumerableProperties(value);
+ var keys = ctx.showHidden ? getProperties(value) : visibleKeys;
+
+ var name, nameSuffix;
+
+ // Some type of object without properties can be shortcut.
+ // In IE, errors have a single `stack` property, or if they are vanilla `Error`,
+ // a `stack` plus `description` property; ignore those for consistency.
+ if (keys.length === 0 || (isError(value) && (
+ (keys.length === 1 && keys[0] === 'stack') ||
+ (keys.length === 2 && keys[0] === 'description' && keys[1] === 'stack')
+ ))) {
+ if (typeof value === 'function') {
+ name = getName(value);
+ nameSuffix = name ? ': ' + name : '';
+ return ctx.stylize('[Function' + nameSuffix + ']', 'special');
+ }
+ if (isRegExp(value)) {
+ return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+ }
+ if (isDate(value)) {
+ return ctx.stylize(Date.prototype.toUTCString.call(value), 'date');
+ }
+ if (isError(value)) {
+ return formatError(value);
+ }
+ }
+
+ var base = ''
+ , array = false
+ , typedArray = false
+ , braces = ['{', '}'];
+
+ if (isTypedArray(value)) {
+ typedArray = true;
+ braces = ['[', ']'];
+ }
+
+ // Make Array say that they are Array
+ if (isArray(value)) {
+ array = true;
+ braces = ['[', ']'];
+ }
+
+ // Make functions say that they are functions
+ if (typeof value === 'function') {
+ name = getName(value);
+ nameSuffix = name ? ': ' + name : '';
+ base = ' [Function' + nameSuffix + ']';
+ }
+
+ // Make RegExps say that they are RegExps
+ if (isRegExp(value)) {
+ base = ' ' + RegExp.prototype.toString.call(value);
+ }
+
+ // Make dates with properties first say the date
+ if (isDate(value)) {
+ base = ' ' + Date.prototype.toUTCString.call(value);
+ }
+
+ // Make error with message first say the error
+ if (isError(value)) {
+ return formatError(value);
+ }
+
+ if (keys.length === 0 && (!array || value.length == 0)) {
+ return braces[0] + base + braces[1];
+ }
+
+ if (recurseTimes < 0) {
+ if (isRegExp(value)) {
+ return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
+ } else {
+ return ctx.stylize('[Object]', 'special');
+ }
+ }
+
+ ctx.seen.push(value);
+
+ var output;
+ if (array) {
+ output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
+ } else if (typedArray) {
+ return formatTypedArray(value);
+ } else {
+ output = keys.map(function(key) {
+ return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
+ });
+ }
+
+ ctx.seen.pop();
+
+ return reduceToSingleString(output, base, braces);
+}
+
+function formatPrimitive(ctx, value) {
+ switch (typeof value) {
+ case 'undefined':
+ return ctx.stylize('undefined', 'undefined');
+
+ case 'string':
+ var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
+ .replace(/'/g, "\\'")
+ .replace(/\\"/g, '"') + '\'';
+ return ctx.stylize(simple, 'string');
+
+ case 'number':
+ if (value === 0 && (1/value) === -Infinity) {
+ return ctx.stylize('-0', 'number');
+ }
+ return ctx.stylize('' + value, 'number');
+
+ case 'boolean':
+ return ctx.stylize('' + value, 'boolean');
+
+ case 'symbol':
+ return ctx.stylize(value.toString(), 'symbol');
+ }
+ // For some reason typeof null is "object", so special case here.
+ if (value === null) {
+ return ctx.stylize('null', 'null');
+ }
+}
+
+function formatError(value) {
+ return '[' + Error.prototype.toString.call(value) + ']';
+}
+
+function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
+ var output = [];
+ for (var i = 0, l = value.length; i < l; ++i) {
+ if (Object.prototype.hasOwnProperty.call(value, String(i))) {
+ output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+ String(i), true));
+ } else {
+ output.push('');
+ }
+ }
+
+ keys.forEach(function(key) {
+ if (!key.match(/^\d+$/)) {
+ output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
+ key, true));
+ }
+ });
+ return output;
+}
+
+function formatTypedArray(value) {
+ var str = '[ ';
+
+ for (var i = 0; i < value.length; ++i) {
+ if (str.length >= config.truncateThreshold - 7) {
+ str += '...';
+ break;
+ }
+ str += value[i] + ', ';
+ }
+ str += ' ]';
+
+ // Removing trailing `, ` if the array was not truncated
+ if (str.indexOf(', ]') !== -1) {
+ str = str.replace(', ]', ' ]');
+ }
+
+ return str;
+}
+
+function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
+ var name;
+ var propDescriptor = Object.getOwnPropertyDescriptor(value, key);
+ var str;
+
+ if (propDescriptor) {
+ if (propDescriptor.get) {
+ if (propDescriptor.set) {
+ str = ctx.stylize('[Getter/Setter]', 'special');
+ } else {
+ str = ctx.stylize('[Getter]', 'special');
+ }
+ } else {
+ if (propDescriptor.set) {
+ str = ctx.stylize('[Setter]', 'special');
+ }
+ }
+ }
+ if (visibleKeys.indexOf(key) < 0) {
+ name = '[' + key + ']';
+ }
+ if (!str) {
+ if (ctx.seen.indexOf(value[key]) < 0) {
+ if (recurseTimes === null) {
+ str = formatValue(ctx, value[key], null);
+ } else {
+ str = formatValue(ctx, value[key], recurseTimes - 1);
+ }
+ if (str.indexOf('\n') > -1) {
+ if (array) {
+ str = str.split('\n').map(function(line) {
+ return ' ' + line;
+ }).join('\n').substr(2);
+ } else {
+ str = '\n' + str.split('\n').map(function(line) {
+ return ' ' + line;
+ }).join('\n');
+ }
+ }
+ } else {
+ str = ctx.stylize('[Circular]', 'special');
+ }
+ }
+ if (typeof name === 'undefined') {
+ if (array && key.match(/^\d+$/)) {
+ return str;
+ }
+ name = JSON.stringify('' + key);
+ if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
+ name = name.substr(1, name.length - 2);
+ name = ctx.stylize(name, 'name');
+ } else {
+ name = name.replace(/'/g, "\\'")
+ .replace(/\\"/g, '"')
+ .replace(/(^"|"$)/g, "'");
+ name = ctx.stylize(name, 'string');
+ }
+ }
+
+ return name + ': ' + str;
+}
+
+function reduceToSingleString(output, base, braces) {
+ var length = output.reduce(function(prev, cur) {
+ return prev + cur.length + 1;
+ }, 0);
+
+ if (length > 60) {
+ return braces[0] +
+ (base === '' ? '' : base + '\n ') +
+ ' ' +
+ output.join(',\n ') +
+ ' ' +
+ braces[1];
+ }
+
+ return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
+}
+
+function isTypedArray(ar) {
+ // Unfortunately there's no way to check if an object is a TypedArray
+ // We have to check if it's one of these types
+ return (typeof ar === 'object' && /\w+Array]$/.test(objectToString(ar)));
+}
+
+function isArray(ar) {
+ return Array.isArray(ar) ||
+ (typeof ar === 'object' && objectToString(ar) === '[object Array]');
+}
+
+function isRegExp(re) {
+ return typeof re === 'object' && objectToString(re) === '[object RegExp]';
+}
+
+function isDate(d) {
+ return typeof d === 'object' && objectToString(d) === '[object Date]';
+}
+
+function isError(e) {
+ return typeof e === 'object' && objectToString(e) === '[object Error]';
+}
+
+function objectToString(o) {
+ return Object.prototype.toString.call(o);
+}
+
+},{"../config":4,"./getEnumerableProperties":17,"./getProperties":21,"get-func-name":36}],24:[function(require,module,exports){
+/*!
+ * Chai - isNaN utility
+ * Copyright(c) 2012-2015 Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .isNaN(value)
+ *
+ * Checks if the given value is NaN or not.
+ *
+ * utils.isNaN(NaN); // true
+ *
+ * @param {Value} The value which has to be checked if it is NaN
+ * @name isNaN
+ * @api private
+ */
+
+function isNaN(value) {
+ // Refer http://www.ecma-international.org/ecma-262/6.0/#sec-isnan-number
+ // section's NOTE.
+ return value !== value;
+}
+
+// If ECMAScript 6's Number.isNaN is present, prefer that.
+module.exports = Number.isNaN || isNaN;
+
+},{}],25:[function(require,module,exports){
+var config = require('../config');
+
+/*!
+ * Chai - isProxyEnabled helper
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .isProxyEnabled()
+ *
+ * Helper function to check if Chai's proxy protection feature is enabled. If
+ * proxies are unsupported or disabled via the user's Chai config, then return
+ * false. Otherwise, return true.
+ *
+ * @namespace Utils
+ * @name isProxyEnabled
+ */
+
+module.exports = function isProxyEnabled() {
+ return config.useProxy &&
+ typeof Proxy !== 'undefined' &&
+ typeof Reflect !== 'undefined';
+};
+
+},{"../config":4}],26:[function(require,module,exports){
+/*!
+ * Chai - flag utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var inspect = require('./inspect');
+var config = require('../config');
+
+/**
+ * ### .objDisplay(object)
+ *
+ * Determines if an object or an array matches
+ * criteria to be inspected in-line for error
+ * messages or should be truncated.
+ *
+ * @param {Mixed} javascript object to inspect
+ * @name objDisplay
+ * @namespace Utils
+ * @api public
+ */
+
+module.exports = function objDisplay(obj) {
+ var str = inspect(obj)
+ , type = Object.prototype.toString.call(obj);
+
+ if (config.truncateThreshold && str.length >= config.truncateThreshold) {
+ if (type === '[object Function]') {
+ return !obj.name || obj.name === ''
+ ? '[Function]'
+ : '[Function: ' + obj.name + ']';
+ } else if (type === '[object Array]') {
+ return '[ Array(' + obj.length + ') ]';
+ } else if (type === '[object Object]') {
+ var keys = Object.keys(obj)
+ , kstr = keys.length > 2
+ ? keys.splice(0, 2).join(', ') + ', ...'
+ : keys.join(', ');
+ return '{ Object (' + kstr + ') }';
+ } else {
+ return str;
+ }
+ } else {
+ return str;
+ }
+};
+
+},{"../config":4,"./inspect":23}],27:[function(require,module,exports){
+/*!
+ * Chai - overwriteChainableMethod utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+var chai = require('../../chai');
+var transferFlags = require('./transferFlags');
+
+/**
+ * ### .overwriteChainableMethod(ctx, name, method, chainingBehavior)
+ *
+ * Overwrites an already existing chainable method
+ * and provides access to the previous function or
+ * property. Must return functions to be used for
+ * name.
+ *
+ * utils.overwriteChainableMethod(chai.Assertion.prototype, 'lengthOf',
+ * function (_super) {
+ * }
+ * , function (_super) {
+ * }
+ * );
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ * chai.Assertion.overwriteChainableMethod('foo', fn, fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ * expect(myFoo).to.have.lengthOf(3);
+ * expect(myFoo).to.have.lengthOf.above(3);
+ *
+ * @param {Object} ctx object whose method / property is to be overwritten
+ * @param {String} name of method / property to overwrite
+ * @param {Function} method function that returns a function to be used for name
+ * @param {Function} chainingBehavior function that returns a function to be used for property
+ * @namespace Utils
+ * @name overwriteChainableMethod
+ * @api public
+ */
+
+module.exports = function overwriteChainableMethod(ctx, name, method, chainingBehavior) {
+ var chainableBehavior = ctx.__methods[name];
+
+ var _chainingBehavior = chainableBehavior.chainingBehavior;
+ chainableBehavior.chainingBehavior = function overwritingChainableMethodGetter() {
+ var result = chainingBehavior(_chainingBehavior).call(this);
+ if (result !== undefined) {
+ return result;
+ }
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ };
+
+ var _method = chainableBehavior.method;
+ chainableBehavior.method = function overwritingChainableMethodWrapper() {
+ var result = method(_method).apply(this, arguments);
+ if (result !== undefined) {
+ return result;
+ }
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ };
+};
+
+},{"../../chai":2,"./transferFlags":32}],28:[function(require,module,exports){
+/*!
+ * Chai - overwriteMethod utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+var addLengthGuard = require('./addLengthGuard');
+var chai = require('../../chai');
+var flag = require('./flag');
+var proxify = require('./proxify');
+var transferFlags = require('./transferFlags');
+
+/**
+ * ### .overwriteMethod(ctx, name, fn)
+ *
+ * Overwrites an already existing method and provides
+ * access to previous function. Must return function
+ * to be used for name.
+ *
+ * utils.overwriteMethod(chai.Assertion.prototype, 'equal', function (_super) {
+ * return function (str) {
+ * var obj = utils.flag(this, 'object');
+ * if (obj instanceof Foo) {
+ * new chai.Assertion(obj.value).to.equal(str);
+ * } else {
+ * _super.apply(this, arguments);
+ * }
+ * }
+ * });
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ * chai.Assertion.overwriteMethod('foo', fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ * expect(myFoo).to.equal('bar');
+ *
+ * @param {Object} ctx object whose method is to be overwritten
+ * @param {String} name of method to overwrite
+ * @param {Function} method function that returns a function to be used for name
+ * @namespace Utils
+ * @name overwriteMethod
+ * @api public
+ */
+
+module.exports = function overwriteMethod(ctx, name, method) {
+ var _method = ctx[name]
+ , _super = function () {
+ throw new Error(name + ' is not a function');
+ };
+
+ if (_method && 'function' === typeof _method)
+ _super = _method;
+
+ var overwritingMethodWrapper = function () {
+ // Setting the `ssfi` flag to `overwritingMethodWrapper` causes this
+ // function to be the starting point for removing implementation frames from
+ // the stack trace of a failed assertion.
+ //
+ // However, we only want to use this function as the starting point if the
+ // `lockSsfi` flag isn't set.
+ //
+ // If the `lockSsfi` flag is set, then either this assertion has been
+ // overwritten by another assertion, or this assertion is being invoked from
+ // inside of another assertion. In the first case, the `ssfi` flag has
+ // already been set by the overwriting assertion. In the second case, the
+ // `ssfi` flag has already been set by the outer assertion.
+ if (!flag(this, 'lockSsfi')) {
+ flag(this, 'ssfi', overwritingMethodWrapper);
+ }
+
+ // Setting the `lockSsfi` flag to `true` prevents the overwritten assertion
+ // from changing the `ssfi` flag. By this point, the `ssfi` flag is already
+ // set to the correct starting point for this assertion.
+ var origLockSsfi = flag(this, 'lockSsfi');
+ flag(this, 'lockSsfi', true);
+ var result = method(_super).apply(this, arguments);
+ flag(this, 'lockSsfi', origLockSsfi);
+
+ if (result !== undefined) {
+ return result;
+ }
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ }
+
+ addLengthGuard(overwritingMethodWrapper, name, false);
+ ctx[name] = proxify(overwritingMethodWrapper, name);
+};
+
+},{"../../chai":2,"./addLengthGuard":10,"./flag":15,"./proxify":30,"./transferFlags":32}],29:[function(require,module,exports){
+/*!
+ * Chai - overwriteProperty utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+var chai = require('../../chai');
+var flag = require('./flag');
+var isProxyEnabled = require('./isProxyEnabled');
+var transferFlags = require('./transferFlags');
+
+/**
+ * ### .overwriteProperty(ctx, name, fn)
+ *
+ * Overwrites an already existing property getter and provides
+ * access to previous value. Must return function to use as getter.
+ *
+ * utils.overwriteProperty(chai.Assertion.prototype, 'ok', function (_super) {
+ * return function () {
+ * var obj = utils.flag(this, 'object');
+ * if (obj instanceof Foo) {
+ * new chai.Assertion(obj.name).to.equal('bar');
+ * } else {
+ * _super.call(this);
+ * }
+ * }
+ * });
+ *
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ * chai.Assertion.overwriteProperty('foo', fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ * expect(myFoo).to.be.ok;
+ *
+ * @param {Object} ctx object whose property is to be overwritten
+ * @param {String} name of property to overwrite
+ * @param {Function} getter function that returns a getter function to be used for name
+ * @namespace Utils
+ * @name overwriteProperty
+ * @api public
+ */
+
+module.exports = function overwriteProperty(ctx, name, getter) {
+ var _get = Object.getOwnPropertyDescriptor(ctx, name)
+ , _super = function () {};
+
+ if (_get && 'function' === typeof _get.get)
+ _super = _get.get
+
+ Object.defineProperty(ctx, name,
+ { get: function overwritingPropertyGetter() {
+ // Setting the `ssfi` flag to `overwritingPropertyGetter` causes this
+ // function to be the starting point for removing implementation frames
+ // from the stack trace of a failed assertion.
+ //
+ // However, we only want to use this function as the starting point if
+ // the `lockSsfi` flag isn't set and proxy protection is disabled.
+ //
+ // If the `lockSsfi` flag is set, then either this assertion has been
+ // overwritten by another assertion, or this assertion is being invoked
+ // from inside of another assertion. In the first case, the `ssfi` flag
+ // has already been set by the overwriting assertion. In the second
+ // case, the `ssfi` flag has already been set by the outer assertion.
+ //
+ // If proxy protection is enabled, then the `ssfi` flag has already been
+ // set by the proxy getter.
+ if (!isProxyEnabled() && !flag(this, 'lockSsfi')) {
+ flag(this, 'ssfi', overwritingPropertyGetter);
+ }
+
+ // Setting the `lockSsfi` flag to `true` prevents the overwritten
+ // assertion from changing the `ssfi` flag. By this point, the `ssfi`
+ // flag is already set to the correct starting point for this assertion.
+ var origLockSsfi = flag(this, 'lockSsfi');
+ flag(this, 'lockSsfi', true);
+ var result = getter(_super).call(this);
+ flag(this, 'lockSsfi', origLockSsfi);
+
+ if (result !== undefined) {
+ return result;
+ }
+
+ var newAssertion = new chai.Assertion();
+ transferFlags(this, newAssertion);
+ return newAssertion;
+ }
+ , configurable: true
+ });
+};
+
+},{"../../chai":2,"./flag":15,"./isProxyEnabled":25,"./transferFlags":32}],30:[function(require,module,exports){
+var config = require('../config');
+var flag = require('./flag');
+var getProperties = require('./getProperties');
+var isProxyEnabled = require('./isProxyEnabled');
+
+/*!
+ * Chai - proxify utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .proxify(object)
+ *
+ * Return a proxy of given object that throws an error when a non-existent
+ * property is read. By default, the root cause is assumed to be a misspelled
+ * property, and thus an attempt is made to offer a reasonable suggestion from
+ * the list of existing properties. However, if a nonChainableMethodName is
+ * provided, then the root cause is instead a failure to invoke a non-chainable
+ * method prior to reading the non-existent property.
+ *
+ * If proxies are unsupported or disabled via the user's Chai config, then
+ * return object without modification.
+ *
+ * @param {Object} obj
+ * @param {String} nonChainableMethodName
+ * @namespace Utils
+ * @name proxify
+ */
+
+var builtins = ['__flags', '__methods', '_obj', 'assert'];
+
+module.exports = function proxify(obj, nonChainableMethodName) {
+ if (!isProxyEnabled()) return obj;
+
+ return new Proxy(obj, {
+ get: function proxyGetter(target, property) {
+ // This check is here because we should not throw errors on Symbol properties
+ // such as `Symbol.toStringTag`.
+ // The values for which an error should be thrown can be configured using
+ // the `config.proxyExcludedKeys` setting.
+ if (typeof property === 'string' &&
+ config.proxyExcludedKeys.indexOf(property) === -1 &&
+ !Reflect.has(target, property)) {
+ // Special message for invalid property access of non-chainable methods.
+ if (nonChainableMethodName) {
+ throw Error('Invalid Chai property: ' + nonChainableMethodName + '.' +
+ property + '. See docs for proper usage of "' +
+ nonChainableMethodName + '".');
+ }
+
+ // If the property is reasonably close to an existing Chai property,
+ // suggest that property to the user. Only suggest properties with a
+ // distance less than 4.
+ var suggestion = null;
+ var suggestionDistance = 4;
+ getProperties(target).forEach(function(prop) {
+ if (
+ !Object.prototype.hasOwnProperty(prop) &&
+ builtins.indexOf(prop) === -1
+ ) {
+ var dist = stringDistanceCapped(
+ property,
+ prop,
+ suggestionDistance
+ );
+ if (dist < suggestionDistance) {
+ suggestion = prop;
+ suggestionDistance = dist;
+ }
+ }
+ });
+
+ if (suggestion !== null) {
+ throw Error('Invalid Chai property: ' + property +
+ '. Did you mean "' + suggestion + '"?');
+ } else {
+ throw Error('Invalid Chai property: ' + property);
+ }
+ }
+
+ // Use this proxy getter as the starting point for removing implementation
+ // frames from the stack trace of a failed assertion. For property
+ // assertions, this prevents the proxy getter from showing up in the stack
+ // trace since it's invoked before the property getter. For method and
+ // chainable method assertions, this flag will end up getting changed to
+ // the method wrapper, which is good since this frame will no longer be in
+ // the stack once the method is invoked. Note that Chai builtin assertion
+ // properties such as `__flags` are skipped since this is only meant to
+ // capture the starting point of an assertion. This step is also skipped
+ // if the `lockSsfi` flag is set, thus indicating that this assertion is
+ // being called from within another assertion. In that case, the `ssfi`
+ // flag is already set to the outer assertion's starting point.
+ if (builtins.indexOf(property) === -1 && !flag(target, 'lockSsfi')) {
+ flag(target, 'ssfi', proxyGetter);
+ }
+
+ return Reflect.get(target, property);
+ }
+ });
+};
+
+/**
+ * # stringDistanceCapped(strA, strB, cap)
+ * Return the Levenshtein distance between two strings, but no more than cap.
+ * @param {string} strA
+ * @param {string} strB
+ * @param {number} number
+ * @return {number} min(string distance between strA and strB, cap)
+ * @api private
+ */
+
+function stringDistanceCapped(strA, strB, cap) {
+ if (Math.abs(strA.length - strB.length) >= cap) {
+ return cap;
+ }
+
+ var memo = [];
+ // `memo` is a two-dimensional array containing distances.
+ // memo[i][j] is the distance between strA.slice(0, i) and
+ // strB.slice(0, j).
+ for (var i = 0; i <= strA.length; i++) {
+ memo[i] = Array(strB.length + 1).fill(0);
+ memo[i][0] = i;
+ }
+ for (var j = 0; j < strB.length; j++) {
+ memo[0][j] = j;
+ }
+
+ for (var i = 1; i <= strA.length; i++) {
+ var ch = strA.charCodeAt(i - 1);
+ for (var j = 1; j <= strB.length; j++) {
+ if (Math.abs(i - j) >= cap) {
+ memo[i][j] = cap;
+ continue;
+ }
+ memo[i][j] = Math.min(
+ memo[i - 1][j] + 1,
+ memo[i][j - 1] + 1,
+ memo[i - 1][j - 1] +
+ (ch === strB.charCodeAt(j - 1) ? 0 : 1)
+ );
+ }
+ }
+
+ return memo[strA.length][strB.length];
+}
+
+},{"../config":4,"./flag":15,"./getProperties":21,"./isProxyEnabled":25}],31:[function(require,module,exports){
+/*!
+ * Chai - test utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/*!
+ * Module dependencies
+ */
+
+var flag = require('./flag');
+
+/**
+ * ### .test(object, expression)
+ *
+ * Test and object for expression.
+ *
+ * @param {Object} object (constructed Assertion)
+ * @param {Arguments} chai.Assertion.prototype.assert arguments
+ * @namespace Utils
+ * @name test
+ */
+
+module.exports = function test(obj, args) {
+ var negate = flag(obj, 'negate')
+ , expr = args[0];
+ return negate ? !expr : expr;
+};
+
+},{"./flag":15}],32:[function(require,module,exports){
+/*!
+ * Chai - transferFlags utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .transferFlags(assertion, object, includeAll = true)
+ *
+ * Transfer all the flags for `assertion` to `object`. If
+ * `includeAll` is set to `false`, then the base Chai
+ * assertion flags (namely `object`, `ssfi`, `lockSsfi`,
+ * and `message`) will not be transferred.
+ *
+ *
+ * var newAssertion = new Assertion();
+ * utils.transferFlags(assertion, newAssertion);
+ *
+ * var anotherAssertion = new Assertion(myObj);
+ * utils.transferFlags(assertion, anotherAssertion, false);
+ *
+ * @param {Assertion} assertion the assertion to transfer the flags from
+ * @param {Object} object the object to transfer the flags to; usually a new assertion
+ * @param {Boolean} includeAll
+ * @namespace Utils
+ * @name transferFlags
+ * @api private
+ */
+
+module.exports = function transferFlags(assertion, object, includeAll) {
+ var flags = assertion.__flags || (assertion.__flags = Object.create(null));
+
+ if (!object.__flags) {
+ object.__flags = Object.create(null);
+ }
+
+ includeAll = arguments.length === 3 ? includeAll : true;
+
+ for (var flag in flags) {
+ if (includeAll ||
+ (flag !== 'object' && flag !== 'ssfi' && flag !== 'lockSsfi' && flag != 'message')) {
+ object.__flags[flag] = flags[flag];
+ }
+ }
+};
+
+},{}],33:[function(require,module,exports){
+/*!
+ * assertion-error
+ * Copyright(c) 2013 Jake Luer <jake@qualiancy.com>
+ * MIT Licensed
+ */
+
+/*!
+ * Return a function that will copy properties from
+ * one object to another excluding any originally
+ * listed. Returned function will create a new `{}`.
+ *
+ * @param {String} excluded properties ...
+ * @return {Function}
+ */
+
+function exclude () {
+ var excludes = [].slice.call(arguments);
+
+ function excludeProps (res, obj) {
+ Object.keys(obj).forEach(function (key) {
+ if (!~excludes.indexOf(key)) res[key] = obj[key];
+ });
+ }
+
+ return function extendExclude () {
+ var args = [].slice.call(arguments)
+ , i = 0
+ , res = {};
+
+ for (; i < args.length; i++) {
+ excludeProps(res, args[i]);
+ }
+
+ return res;
+ };
+};
+
+/*!
+ * Primary Exports
+ */
+
+module.exports = AssertionError;
+
+/**
+ * ### AssertionError
+ *
+ * An extension of the JavaScript `Error` constructor for
+ * assertion and validation scenarios.
+ *
+ * @param {String} message
+ * @param {Object} properties to include (optional)
+ * @param {callee} start stack function (optional)
+ */
+
+function AssertionError (message, _props, ssf) {
+ var extend = exclude('name', 'message', 'stack', 'constructor', 'toJSON')
+ , props = extend(_props || {});
+
+ // default values
+ this.message = message || 'Unspecified AssertionError';
+ this.showDiff = false;
+
+ // copy from properties
+ for (var key in props) {
+ this[key] = props[key];
+ }
+
+ // capture stack trace
+ ssf = ssf || AssertionError;
+ if (Error.captureStackTrace) {
+ Error.captureStackTrace(this, ssf);
+ } else {
+ try {
+ throw new Error();
+ } catch(e) {
+ this.stack = e.stack;
+ }
+ }
+}
+
+/*!
+ * Inherit from Error.prototype
+ */
+
+AssertionError.prototype = Object.create(Error.prototype);
+
+/*!
+ * Statically set name
+ */
+
+AssertionError.prototype.name = 'AssertionError';
+
+/*!
+ * Ensure correct constructor
+ */
+
+AssertionError.prototype.constructor = AssertionError;
+
+/**
+ * Allow errors to be converted to JSON for static transfer.
+ *
+ * @param {Boolean} include stack (default: `true`)
+ * @return {Object} object that can be `JSON.stringify`
+ */
+
+AssertionError.prototype.toJSON = function (stack) {
+ var extend = exclude('constructor', 'toJSON', 'stack')
+ , props = extend({ name: this.name }, this);
+
+ // include stack if exists and not turned off
+ if (false !== stack && this.stack) {
+ props.stack = this.stack;
+ }
+
+ return props;
+};
+
+},{}],34:[function(require,module,exports){
+'use strict';
+
+/* !
+ * Chai - checkError utility
+ * Copyright(c) 2012-2016 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .checkError
+ *
+ * Checks that an error conforms to a given set of criteria and/or retrieves information about it.
+ *
+ * @api public
+ */
+
+/**
+ * ### .compatibleInstance(thrown, errorLike)
+ *
+ * Checks if two instances are compatible (strict equal).
+ * Returns false if errorLike is not an instance of Error, because instances
+ * can only be compatible if they're both error instances.
+ *
+ * @name compatibleInstance
+ * @param {Error} thrown error
+ * @param {Error|ErrorConstructor} errorLike object to compare against
+ * @namespace Utils
+ * @api public
+ */
+
+function compatibleInstance(thrown, errorLike) {
+ return errorLike instanceof Error && thrown === errorLike;
+}
+
+/**
+ * ### .compatibleConstructor(thrown, errorLike)
+ *
+ * Checks if two constructors are compatible.
+ * This function can receive either an error constructor or
+ * an error instance as the `errorLike` argument.
+ * Constructors are compatible if they're the same or if one is
+ * an instance of another.
+ *
+ * @name compatibleConstructor
+ * @param {Error} thrown error
+ * @param {Error|ErrorConstructor} errorLike object to compare against
+ * @namespace Utils
+ * @api public
+ */
+
+function compatibleConstructor(thrown, errorLike) {
+ if (errorLike instanceof Error) {
+ // If `errorLike` is an instance of any error we compare their constructors
+ return thrown.constructor === errorLike.constructor || thrown instanceof errorLike.constructor;
+ } else if (errorLike.prototype instanceof Error || errorLike === Error) {
+ // If `errorLike` is a constructor that inherits from Error, we compare `thrown` to `errorLike` directly
+ return thrown.constructor === errorLike || thrown instanceof errorLike;
+ }
+
+ return false;
+}
+
+/**
+ * ### .compatibleMessage(thrown, errMatcher)
+ *
+ * Checks if an error's message is compatible with a matcher (String or RegExp).
+ * If the message contains the String or passes the RegExp test,
+ * it is considered compatible.
+ *
+ * @name compatibleMessage
+ * @param {Error} thrown error
+ * @param {String|RegExp} errMatcher to look for into the message
+ * @namespace Utils
+ * @api public
+ */
+
+function compatibleMessage(thrown, errMatcher) {
+ var comparisonString = typeof thrown === 'string' ? thrown : thrown.message;
+ if (errMatcher instanceof RegExp) {
+ return errMatcher.test(comparisonString);
+ } else if (typeof errMatcher === 'string') {
+ return comparisonString.indexOf(errMatcher) !== -1; // eslint-disable-line no-magic-numbers
+ }
+
+ return false;
+}
+
+/**
+ * ### .getFunctionName(constructorFn)
+ *
+ * Returns the name of a function.
+ * This also includes a polyfill function if `constructorFn.name` is not defined.
+ *
+ * @name getFunctionName
+ * @param {Function} constructorFn
+ * @namespace Utils
+ * @api private
+ */
+
+var functionNameMatch = /\s*function(?:\s|\s*\/\*[^(?:*\/)]+\*\/\s*)*([^\(\/]+)/;
+function getFunctionName(constructorFn) {
+ var name = '';
+ if (typeof constructorFn.name === 'undefined') {
+ // Here we run a polyfill if constructorFn.name is not defined
+ var match = String(constructorFn).match(functionNameMatch);
+ if (match) {
+ name = match[1];
+ }
+ } else {
+ name = constructorFn.name;
+ }
+
+ return name;
+}
+
+/**
+ * ### .getConstructorName(errorLike)
+ *
+ * Gets the constructor name for an Error instance or constructor itself.
+ *
+ * @name getConstructorName
+ * @param {Error|ErrorConstructor} errorLike
+ * @namespace Utils
+ * @api public
+ */
+
+function getConstructorName(errorLike) {
+ var constructorName = errorLike;
+ if (errorLike instanceof Error) {
+ constructorName = getFunctionName(errorLike.constructor);
+ } else if (typeof errorLike === 'function') {
+ // If `err` is not an instance of Error it is an error constructor itself or another function.
+ // If we've got a common function we get its name, otherwise we may need to create a new instance
+ // of the error just in case it's a poorly-constructed error. Please see chaijs/chai/issues/45 to know more.
+ constructorName = getFunctionName(errorLike).trim() ||
+ getFunctionName(new errorLike()); // eslint-disable-line new-cap
+ }
+
+ return constructorName;
+}
+
+/**
+ * ### .getMessage(errorLike)
+ *
+ * Gets the error message from an error.
+ * If `err` is a String itself, we return it.
+ * If the error has no message, we return an empty string.
+ *
+ * @name getMessage
+ * @param {Error|String} errorLike
+ * @namespace Utils
+ * @api public
+ */
+
+function getMessage(errorLike) {
+ var msg = '';
+ if (errorLike && errorLike.message) {
+ msg = errorLike.message;
+ } else if (typeof errorLike === 'string') {
+ msg = errorLike;
+ }
+
+ return msg;
+}
+
+module.exports = {
+ compatibleInstance: compatibleInstance,
+ compatibleConstructor: compatibleConstructor,
+ compatibleMessage: compatibleMessage,
+ getMessage: getMessage,
+ getConstructorName: getConstructorName,
+};
+
+},{}],35:[function(require,module,exports){
+'use strict';
+/* globals Symbol: false, Uint8Array: false, WeakMap: false */
+/*!
+ * deep-eql
+ * Copyright(c) 2013 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+var type = require('type-detect');
+function FakeMap() {
+ this._key = 'chai/deep-eql__' + Math.random() + Date.now();
+}
+
+FakeMap.prototype = {
+ get: function getMap(key) {
+ return key[this._key];
+ },
+ set: function setMap(key, value) {
+ if (Object.isExtensible(key)) {
+ Object.defineProperty(key, this._key, {
+ value: value,
+ configurable: true,
+ });
+ }
+ },
+};
+
+var MemoizeMap = typeof WeakMap === 'function' ? WeakMap : FakeMap;
+/*!
+ * Check to see if the MemoizeMap has recorded a result of the two operands
+ *
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @param {MemoizeMap} memoizeMap
+ * @returns {Boolean|null} result
+*/
+function memoizeCompare(leftHandOperand, rightHandOperand, memoizeMap) {
+ // Technically, WeakMap keys can *only* be objects, not primitives.
+ if (!memoizeMap || isPrimitive(leftHandOperand) || isPrimitive(rightHandOperand)) {
+ return null;
+ }
+ var leftHandMap = memoizeMap.get(leftHandOperand);
+ if (leftHandMap) {
+ var result = leftHandMap.get(rightHandOperand);
+ if (typeof result === 'boolean') {
+ return result;
+ }
+ }
+ return null;
+}
+
+/*!
+ * Set the result of the equality into the MemoizeMap
+ *
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @param {MemoizeMap} memoizeMap
+ * @param {Boolean} result
+*/
+function memoizeSet(leftHandOperand, rightHandOperand, memoizeMap, result) {
+ // Technically, WeakMap keys can *only* be objects, not primitives.
+ if (!memoizeMap || isPrimitive(leftHandOperand) || isPrimitive(rightHandOperand)) {
+ return;
+ }
+ var leftHandMap = memoizeMap.get(leftHandOperand);
+ if (leftHandMap) {
+ leftHandMap.set(rightHandOperand, result);
+ } else {
+ leftHandMap = new MemoizeMap();
+ leftHandMap.set(rightHandOperand, result);
+ memoizeMap.set(leftHandOperand, leftHandMap);
+ }
+}
+
+/*!
+ * Primary Export
+ */
+
+module.exports = deepEqual;
+module.exports.MemoizeMap = MemoizeMap;
+
+/**
+ * Assert deeply nested sameValue equality between two objects of any type.
+ *
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @param {Object} [options] (optional) Additional options
+ * @param {Array} [options.comparator] (optional) Override default algorithm, determining custom equality.
+ * @param {Array} [options.memoize] (optional) Provide a custom memoization object which will cache the results of
+ complex objects for a speed boost. By passing `false` you can disable memoization, but this will cause circular
+ references to blow the stack.
+ * @return {Boolean} equal match
+ */
+function deepEqual(leftHandOperand, rightHandOperand, options) {
+ // If we have a comparator, we can't assume anything; so bail to its check first.
+ if (options && options.comparator) {
+ return extensiveDeepEqual(leftHandOperand, rightHandOperand, options);
+ }
+
+ var simpleResult = simpleEqual(leftHandOperand, rightHandOperand);
+ if (simpleResult !== null) {
+ return simpleResult;
+ }
+
+ // Deeper comparisons are pushed through to a larger function
+ return extensiveDeepEqual(leftHandOperand, rightHandOperand, options);
+}
+
+/**
+ * Many comparisons can be canceled out early via simple equality or primitive checks.
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @return {Boolean|null} equal match
+ */
+function simpleEqual(leftHandOperand, rightHandOperand) {
+ // Equal references (except for Numbers) can be returned early
+ if (leftHandOperand === rightHandOperand) {
+ // Handle +-0 cases
+ return leftHandOperand !== 0 || 1 / leftHandOperand === 1 / rightHandOperand;
+ }
+
+ // handle NaN cases
+ if (
+ leftHandOperand !== leftHandOperand && // eslint-disable-line no-self-compare
+ rightHandOperand !== rightHandOperand // eslint-disable-line no-self-compare
+ ) {
+ return true;
+ }
+
+ // Anything that is not an 'object', i.e. symbols, functions, booleans, numbers,
+ // strings, and undefined, can be compared by reference.
+ if (isPrimitive(leftHandOperand) || isPrimitive(rightHandOperand)) {
+ // Easy out b/c it would have passed the first equality check
+ return false;
+ }
+ return null;
+}
+
+/*!
+ * The main logic of the `deepEqual` function.
+ *
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @param {Object} [options] (optional) Additional options
+ * @param {Array} [options.comparator] (optional) Override default algorithm, determining custom equality.
+ * @param {Array} [options.memoize] (optional) Provide a custom memoization object which will cache the results of
+ complex objects for a speed boost. By passing `false` you can disable memoization, but this will cause circular
+ references to blow the stack.
+ * @return {Boolean} equal match
+*/
+function extensiveDeepEqual(leftHandOperand, rightHandOperand, options) {
+ options = options || {};
+ options.memoize = options.memoize === false ? false : options.memoize || new MemoizeMap();
+ var comparator = options && options.comparator;
+
+ // Check if a memoized result exists.
+ var memoizeResultLeft = memoizeCompare(leftHandOperand, rightHandOperand, options.memoize);
+ if (memoizeResultLeft !== null) {
+ return memoizeResultLeft;
+ }
+ var memoizeResultRight = memoizeCompare(rightHandOperand, leftHandOperand, options.memoize);
+ if (memoizeResultRight !== null) {
+ return memoizeResultRight;
+ }
+
+ // If a comparator is present, use it.
+ if (comparator) {
+ var comparatorResult = comparator(leftHandOperand, rightHandOperand);
+ // Comparators may return null, in which case we want to go back to default behavior.
+ if (comparatorResult === false || comparatorResult === true) {
+ memoizeSet(leftHandOperand, rightHandOperand, options.memoize, comparatorResult);
+ return comparatorResult;
+ }
+ // To allow comparators to override *any* behavior, we ran them first. Since it didn't decide
+ // what to do, we need to make sure to return the basic tests first before we move on.
+ var simpleResult = simpleEqual(leftHandOperand, rightHandOperand);
+ if (simpleResult !== null) {
+ // Don't memoize this, it takes longer to set/retrieve than to just compare.
+ return simpleResult;
+ }
+ }
+
+ var leftHandType = type(leftHandOperand);
+ if (leftHandType !== type(rightHandOperand)) {
+ memoizeSet(leftHandOperand, rightHandOperand, options.memoize, false);
+ return false;
+ }
+
+ // Temporarily set the operands in the memoize object to prevent blowing the stack
+ memoizeSet(leftHandOperand, rightHandOperand, options.memoize, true);
+
+ var result = extensiveDeepEqualByType(leftHandOperand, rightHandOperand, leftHandType, options);
+ memoizeSet(leftHandOperand, rightHandOperand, options.memoize, result);
+ return result;
+}
+
+function extensiveDeepEqualByType(leftHandOperand, rightHandOperand, leftHandType, options) {
+ switch (leftHandType) {
+ case 'String':
+ case 'Number':
+ case 'Boolean':
+ case 'Date':
+ // If these types are their instance types (e.g. `new Number`) then re-deepEqual against their values
+ return deepEqual(leftHandOperand.valueOf(), rightHandOperand.valueOf());
+ case 'Promise':
+ case 'Symbol':
+ case 'function':
+ case 'WeakMap':
+ case 'WeakSet':
+ case 'Error':
+ return leftHandOperand === rightHandOperand;
+ case 'Arguments':
+ case 'Int8Array':
+ case 'Uint8Array':
+ case 'Uint8ClampedArray':
+ case 'Int16Array':
+ case 'Uint16Array':
+ case 'Int32Array':
+ case 'Uint32Array':
+ case 'Float32Array':
+ case 'Float64Array':
+ case 'Array':
+ return iterableEqual(leftHandOperand, rightHandOperand, options);
+ case 'RegExp':
+ return regexpEqual(leftHandOperand, rightHandOperand);
+ case 'Generator':
+ return generatorEqual(leftHandOperand, rightHandOperand, options);
+ case 'DataView':
+ return iterableEqual(new Uint8Array(leftHandOperand.buffer), new Uint8Array(rightHandOperand.buffer), options);
+ case 'ArrayBuffer':
+ return iterableEqual(new Uint8Array(leftHandOperand), new Uint8Array(rightHandOperand), options);
+ case 'Set':
+ return entriesEqual(leftHandOperand, rightHandOperand, options);
+ case 'Map':
+ return entriesEqual(leftHandOperand, rightHandOperand, options);
+ default:
+ return objectEqual(leftHandOperand, rightHandOperand, options);
+ }
+}
+
+/*!
+ * Compare two Regular Expressions for equality.
+ *
+ * @param {RegExp} leftHandOperand
+ * @param {RegExp} rightHandOperand
+ * @return {Boolean} result
+ */
+
+function regexpEqual(leftHandOperand, rightHandOperand) {
+ return leftHandOperand.toString() === rightHandOperand.toString();
+}
+
+/*!
+ * Compare two Sets/Maps for equality. Faster than other equality functions.
+ *
+ * @param {Set} leftHandOperand
+ * @param {Set} rightHandOperand
+ * @param {Object} [options] (Optional)
+ * @return {Boolean} result
+ */
+
+function entriesEqual(leftHandOperand, rightHandOperand, options) {
+ // IE11 doesn't support Set#entries or Set#@@iterator, so we need manually populate using Set#forEach
+ if (leftHandOperand.size !== rightHandOperand.size) {
+ return false;
+ }
+ if (leftHandOperand.size === 0) {
+ return true;
+ }
+ var leftHandItems = [];
+ var rightHandItems = [];
+ leftHandOperand.forEach(function gatherEntries(key, value) {
+ leftHandItems.push([ key, value ]);
+ });
+ rightHandOperand.forEach(function gatherEntries(key, value) {
+ rightHandItems.push([ key, value ]);
+ });
+ return iterableEqual(leftHandItems.sort(), rightHandItems.sort(), options);
+}
+
+/*!
+ * Simple equality for flat iterable objects such as Arrays, TypedArrays or Node.js buffers.
+ *
+ * @param {Iterable} leftHandOperand
+ * @param {Iterable} rightHandOperand
+ * @param {Object} [options] (Optional)
+ * @return {Boolean} result
+ */
+
+function iterableEqual(leftHandOperand, rightHandOperand, options) {
+ var length = leftHandOperand.length;
+ if (length !== rightHandOperand.length) {
+ return false;
+ }
+ if (length === 0) {
+ return true;
+ }
+ var index = -1;
+ while (++index < length) {
+ if (deepEqual(leftHandOperand[index], rightHandOperand[index], options) === false) {
+ return false;
+ }
+ }
+ return true;
+}
+
+/*!
+ * Simple equality for generator objects such as those returned by generator functions.
+ *
+ * @param {Iterable} leftHandOperand
+ * @param {Iterable} rightHandOperand
+ * @param {Object} [options] (Optional)
+ * @return {Boolean} result
+ */
+
+function generatorEqual(leftHandOperand, rightHandOperand, options) {
+ return iterableEqual(getGeneratorEntries(leftHandOperand), getGeneratorEntries(rightHandOperand), options);
+}
+
+/*!
+ * Determine if the given object has an @@iterator function.
+ *
+ * @param {Object} target
+ * @return {Boolean} `true` if the object has an @@iterator function.
+ */
+function hasIteratorFunction(target) {
+ return typeof Symbol !== 'undefined' &&
+ typeof target === 'object' &&
+ typeof Symbol.iterator !== 'undefined' &&
+ typeof target[Symbol.iterator] === 'function';
+}
+
+/*!
+ * Gets all iterator entries from the given Object. If the Object has no @@iterator function, returns an empty array.
+ * This will consume the iterator - which could have side effects depending on the @@iterator implementation.
+ *
+ * @param {Object} target
+ * @returns {Array} an array of entries from the @@iterator function
+ */
+function getIteratorEntries(target) {
+ if (hasIteratorFunction(target)) {
+ try {
+ return getGeneratorEntries(target[Symbol.iterator]());
+ } catch (iteratorError) {
+ return [];
+ }
+ }
+ return [];
+}
+
+/*!
+ * Gets all entries from a Generator. This will consume the generator - which could have side effects.
+ *
+ * @param {Generator} target
+ * @returns {Array} an array of entries from the Generator.
+ */
+function getGeneratorEntries(generator) {
+ var generatorResult = generator.next();
+ var accumulator = [ generatorResult.value ];
+ while (generatorResult.done === false) {
+ generatorResult = generator.next();
+ accumulator.push(generatorResult.value);
+ }
+ return accumulator;
+}
+
+/*!
+ * Gets all own and inherited enumerable keys from a target.
+ *
+ * @param {Object} target
+ * @returns {Array} an array of own and inherited enumerable keys from the target.
+ */
+function getEnumerableKeys(target) {
+ var keys = [];
+ for (var key in target) {
+ keys.push(key);
+ }
+ return keys;
+}
+
+/*!
+ * Determines if two objects have matching values, given a set of keys. Defers to deepEqual for the equality check of
+ * each key. If any value of the given key is not equal, the function will return false (early).
+ *
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @param {Array} keys An array of keys to compare the values of leftHandOperand and rightHandOperand against
+ * @param {Object} [options] (Optional)
+ * @return {Boolean} result
+ */
+function keysEqual(leftHandOperand, rightHandOperand, keys, options) {
+ var length = keys.length;
+ if (length === 0) {
+ return true;
+ }
+ for (var i = 0; i < length; i += 1) {
+ if (deepEqual(leftHandOperand[keys[i]], rightHandOperand[keys[i]], options) === false) {
+ return false;
+ }
+ }
+ return true;
+}
+
+/*!
+ * Recursively check the equality of two Objects. Once basic sameness has been established it will defer to `deepEqual`
+ * for each enumerable key in the object.
+ *
+ * @param {Mixed} leftHandOperand
+ * @param {Mixed} rightHandOperand
+ * @param {Object} [options] (Optional)
+ * @return {Boolean} result
+ */
+
+function objectEqual(leftHandOperand, rightHandOperand, options) {
+ var leftHandKeys = getEnumerableKeys(leftHandOperand);
+ var rightHandKeys = getEnumerableKeys(rightHandOperand);
+ if (leftHandKeys.length && leftHandKeys.length === rightHandKeys.length) {
+ leftHandKeys.sort();
+ rightHandKeys.sort();
+ if (iterableEqual(leftHandKeys, rightHandKeys) === false) {
+ return false;
+ }
+ return keysEqual(leftHandOperand, rightHandOperand, leftHandKeys, options);
+ }
+
+ var leftHandEntries = getIteratorEntries(leftHandOperand);
+ var rightHandEntries = getIteratorEntries(rightHandOperand);
+ if (leftHandEntries.length && leftHandEntries.length === rightHandEntries.length) {
+ leftHandEntries.sort();
+ rightHandEntries.sort();
+ return iterableEqual(leftHandEntries, rightHandEntries, options);
+ }
+
+ if (leftHandKeys.length === 0 &&
+ leftHandEntries.length === 0 &&
+ rightHandKeys.length === 0 &&
+ rightHandEntries.length === 0) {
+ return true;
+ }
+
+ return false;
+}
+
+/*!
+ * Returns true if the argument is a primitive.
+ *
+ * This intentionally returns true for all objects that can be compared by reference,
+ * including functions and symbols.
+ *
+ * @param {Mixed} value
+ * @return {Boolean} result
+ */
+function isPrimitive(value) {
+ return value === null || typeof value !== 'object';
+}
+
+},{"type-detect":38}],36:[function(require,module,exports){
+'use strict';
+
+/* !
+ * Chai - getFuncName utility
+ * Copyright(c) 2012-2016 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### .getFuncName(constructorFn)
+ *
+ * Returns the name of a function.
+ * When a non-function instance is passed, returns `null`.
+ * This also includes a polyfill function if `aFunc.name` is not defined.
+ *
+ * @name getFuncName
+ * @param {Function} funct
+ * @namespace Utils
+ * @api public
+ */
+
+var toString = Function.prototype.toString;
+var functionNameMatch = /\s*function(?:\s|\s*\/\*[^(?:*\/)]+\*\/\s*)*([^\s\(\/]+)/;
+function getFuncName(aFunc) {
+ if (typeof aFunc !== 'function') {
+ return null;
+ }
+
+ var name = '';
+ if (typeof Function.prototype.name === 'undefined' && typeof aFunc.name === 'undefined') {
+ // Here we run a polyfill if Function does not support the `name` property and if aFunc.name is not defined
+ var match = toString.call(aFunc).match(functionNameMatch);
+ if (match) {
+ name = match[1];
+ }
+ } else {
+ // If we've got a `name` property we just use it
+ name = aFunc.name;
+ }
+
+ return name;
+}
+
+module.exports = getFuncName;
+
+},{}],37:[function(require,module,exports){
+'use strict';
+
+/* !
+ * Chai - pathval utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * @see https://github.com/logicalparadox/filtr
+ * MIT Licensed
+ */
+
+/**
+ * ### .hasProperty(object, name)
+ *
+ * This allows checking whether an object has own
+ * or inherited from prototype chain named property.
+ *
+ * Basically does the same thing as the `in`
+ * operator but works properly with null/undefined values
+ * and other primitives.
+ *
+ * var obj = {
+ * arr: ['a', 'b', 'c']
+ * , str: 'Hello'
+ * }
+ *
+ * The following would be the results.
+ *
+ * hasProperty(obj, 'str'); // true
+ * hasProperty(obj, 'constructor'); // true
+ * hasProperty(obj, 'bar'); // false
+ *
+ * hasProperty(obj.str, 'length'); // true
+ * hasProperty(obj.str, 1); // true
+ * hasProperty(obj.str, 5); // false
+ *
+ * hasProperty(obj.arr, 'length'); // true
+ * hasProperty(obj.arr, 2); // true
+ * hasProperty(obj.arr, 3); // false
+ *
+ * @param {Object} object
+ * @param {String|Symbol} name
+ * @returns {Boolean} whether it exists
+ * @namespace Utils
+ * @name hasProperty
+ * @api public
+ */
+
+function hasProperty(obj, name) {
+ if (typeof obj === 'undefined' || obj === null) {
+ return false;
+ }
+
+ // The `in` operator does not work with primitives.
+ return name in Object(obj);
+}
+
+/* !
+ * ## parsePath(path)
+ *
+ * Helper function used to parse string object
+ * paths. Use in conjunction with `internalGetPathValue`.
+ *
+ * var parsed = parsePath('myobject.property.subprop');
+ *
+ * ### Paths:
+ *
+ * * Can be infinitely deep and nested.
+ * * Arrays are also valid using the formal `myobject.document[3].property`.
+ * * Literal dots and brackets (not delimiter) must be backslash-escaped.
+ *
+ * @param {String} path
+ * @returns {Object} parsed
+ * @api private
+ */
+
+function parsePath(path) {
+ var str = path.replace(/([^\\])\[/g, '$1.[');
+ var parts = str.match(/(\\\.|[^.]+?)+/g);
+ return parts.map(function mapMatches(value) {
+ var regexp = /^\[(\d+)\]$/;
+ var mArr = regexp.exec(value);
+ var parsed = null;
+ if (mArr) {
+ parsed = { i: parseFloat(mArr[1]) };
+ } else {
+ parsed = { p: value.replace(/\\([.\[\]])/g, '$1') };
+ }
+
+ return parsed;
+ });
+}
+
+/* !
+ * ## internalGetPathValue(obj, parsed[, pathDepth])
+ *
+ * Helper companion function for `.parsePath` that returns
+ * the value located at the parsed address.
+ *
+ * var value = getPathValue(obj, parsed);
+ *
+ * @param {Object} object to search against
+ * @param {Object} parsed definition from `parsePath`.
+ * @param {Number} depth (nesting level) of the property we want to retrieve
+ * @returns {Object|Undefined} value
+ * @api private
+ */
+
+function internalGetPathValue(obj, parsed, pathDepth) {
+ var temporaryValue = obj;
+ var res = null;
+ pathDepth = (typeof pathDepth === 'undefined' ? parsed.length : pathDepth);
+
+ for (var i = 0; i < pathDepth; i++) {
+ var part = parsed[i];
+ if (temporaryValue) {
+ if (typeof part.p === 'undefined') {
+ temporaryValue = temporaryValue[part.i];
+ } else {
+ temporaryValue = temporaryValue[part.p];
+ }
+
+ if (i === (pathDepth - 1)) {
+ res = temporaryValue;
+ }
+ }
+ }
+
+ return res;
+}
+
+/* !
+ * ## internalSetPathValue(obj, value, parsed)
+ *
+ * Companion function for `parsePath` that sets
+ * the value located at a parsed address.
+ *
+ * internalSetPathValue(obj, 'value', parsed);
+ *
+ * @param {Object} object to search and define on
+ * @param {*} value to use upon set
+ * @param {Object} parsed definition from `parsePath`
+ * @api private
+ */
+
+function internalSetPathValue(obj, val, parsed) {
+ var tempObj = obj;
+ var pathDepth = parsed.length;
+ var part = null;
+ // Here we iterate through every part of the path
+ for (var i = 0; i < pathDepth; i++) {
+ var propName = null;
+ var propVal = null;
+ part = parsed[i];
+
+ // If it's the last part of the path, we set the 'propName' value with the property name
+ if (i === (pathDepth - 1)) {
+ propName = typeof part.p === 'undefined' ? part.i : part.p;
+ // Now we set the property with the name held by 'propName' on object with the desired val
+ tempObj[propName] = val;
+ } else if (typeof part.p !== 'undefined' && tempObj[part.p]) {
+ tempObj = tempObj[part.p];
+ } else if (typeof part.i !== 'undefined' && tempObj[part.i]) {
+ tempObj = tempObj[part.i];
+ } else {
+ // If the obj doesn't have the property we create one with that name to define it
+ var next = parsed[i + 1];
+ // Here we set the name of the property which will be defined
+ propName = typeof part.p === 'undefined' ? part.i : part.p;
+ // Here we decide if this property will be an array or a new object
+ propVal = typeof next.p === 'undefined' ? [] : {};
+ tempObj[propName] = propVal;
+ tempObj = tempObj[propName];
+ }
+ }
+}
+
+/**
+ * ### .getPathInfo(object, path)
+ *
+ * This allows the retrieval of property info in an
+ * object given a string path.
+ *
+ * The path info consists of an object with the
+ * following properties:
+ *
+ * * parent - The parent object of the property referenced by `path`
+ * * name - The name of the final property, a number if it was an array indexer
+ * * value - The value of the property, if it exists, otherwise `undefined`
+ * * exists - Whether the property exists or not
+ *
+ * @param {Object} object
+ * @param {String} path
+ * @returns {Object} info
+ * @namespace Utils
+ * @name getPathInfo
+ * @api public
+ */
+
+function getPathInfo(obj, path) {
+ var parsed = parsePath(path);
+ var last = parsed[parsed.length - 1];
+ var info = {
+ parent: parsed.length > 1 ? internalGetPathValue(obj, parsed, parsed.length - 1) : obj,
+ name: last.p || last.i,
+ value: internalGetPathValue(obj, parsed),
+ };
+ info.exists = hasProperty(info.parent, info.name);
+
+ return info;
+}
+
+/**
+ * ### .getPathValue(object, path)
+ *
+ * This allows the retrieval of values in an
+ * object given a string path.
+ *
+ * var obj = {
+ * prop1: {
+ * arr: ['a', 'b', 'c']
+ * , str: 'Hello'
+ * }
+ * , prop2: {
+ * arr: [ { nested: 'Universe' } ]
+ * , str: 'Hello again!'
+ * }
+ * }
+ *
+ * The following would be the results.
+ *
+ * getPathValue(obj, 'prop1.str'); // Hello
+ * getPathValue(obj, 'prop1.att[2]'); // b
+ * getPathValue(obj, 'prop2.arr[0].nested'); // Universe
+ *
+ * @param {Object} object
+ * @param {String} path
+ * @returns {Object} value or `undefined`
+ * @namespace Utils
+ * @name getPathValue
+ * @api public
+ */
+
+function getPathValue(obj, path) {
+ var info = getPathInfo(obj, path);
+ return info.value;
+}
+
+/**
+ * ### .setPathValue(object, path, value)
+ *
+ * Define the value in an object at a given string path.
+ *
+ * ```js
+ * var obj = {
+ * prop1: {
+ * arr: ['a', 'b', 'c']
+ * , str: 'Hello'
+ * }
+ * , prop2: {
+ * arr: [ { nested: 'Universe' } ]
+ * , str: 'Hello again!'
+ * }
+ * };
+ * ```
+ *
+ * The following would be acceptable.
+ *
+ * ```js
+ * var properties = require('tea-properties');
+ * properties.set(obj, 'prop1.str', 'Hello Universe!');
+ * properties.set(obj, 'prop1.arr[2]', 'B');
+ * properties.set(obj, 'prop2.arr[0].nested.value', { hello: 'universe' });
+ * ```
+ *
+ * @param {Object} object
+ * @param {String} path
+ * @param {Mixed} value
+ * @api private
+ */
+
+function setPathValue(obj, path, val) {
+ var parsed = parsePath(path);
+ internalSetPathValue(obj, val, parsed);
+ return obj;
+}
+
+module.exports = {
+ hasProperty: hasProperty,
+ getPathInfo: getPathInfo,
+ getPathValue: getPathValue,
+ setPathValue: setPathValue,
+};
+
+},{}],38:[function(require,module,exports){
+(function (global, factory) {
+ typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+ typeof define === 'function' && define.amd ? define(factory) :
+ (global.typeDetect = factory());
+}(this, (function () { 'use strict';
+
+/* !
+ * type-detect
+ * Copyright(c) 2013 jake luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+var promiseExists = typeof Promise === 'function';
+
+/* eslint-disable no-undef */
+var globalObject = typeof self === 'object' ? self : global; // eslint-disable-line id-blacklist
+
+var symbolExists = typeof Symbol !== 'undefined';
+var mapExists = typeof Map !== 'undefined';
+var setExists = typeof Set !== 'undefined';
+var weakMapExists = typeof WeakMap !== 'undefined';
+var weakSetExists = typeof WeakSet !== 'undefined';
+var dataViewExists = typeof DataView !== 'undefined';
+var symbolIteratorExists = symbolExists && typeof Symbol.iterator !== 'undefined';
+var symbolToStringTagExists = symbolExists && typeof Symbol.toStringTag !== 'undefined';
+var setEntriesExists = setExists && typeof Set.prototype.entries === 'function';
+var mapEntriesExists = mapExists && typeof Map.prototype.entries === 'function';
+var setIteratorPrototype = setEntriesExists && Object.getPrototypeOf(new Set().entries());
+var mapIteratorPrototype = mapEntriesExists && Object.getPrototypeOf(new Map().entries());
+var arrayIteratorExists = symbolIteratorExists && typeof Array.prototype[Symbol.iterator] === 'function';
+var arrayIteratorPrototype = arrayIteratorExists && Object.getPrototypeOf([][Symbol.iterator]());
+var stringIteratorExists = symbolIteratorExists && typeof String.prototype[Symbol.iterator] === 'function';
+var stringIteratorPrototype = stringIteratorExists && Object.getPrototypeOf(''[Symbol.iterator]());
+var toStringLeftSliceLength = 8;
+var toStringRightSliceLength = -1;
+/**
+ * ### typeOf (obj)
+ *
+ * Uses `Object.prototype.toString` to determine the type of an object,
+ * normalising behaviour across engine versions & well optimised.
+ *
+ * @param {Mixed} object
+ * @return {String} object type
+ * @api public
+ */
+function typeDetect(obj) {
+ /* ! Speed optimisation
+ * Pre:
+ * string literal x 3,039,035 ops/sec ±1.62% (78 runs sampled)
+ * boolean literal x 1,424,138 ops/sec ±4.54% (75 runs sampled)
+ * number literal x 1,653,153 ops/sec ±1.91% (82 runs sampled)
+ * undefined x 9,978,660 ops/sec ±1.92% (75 runs sampled)
+ * function x 2,556,769 ops/sec ±1.73% (77 runs sampled)
+ * Post:
+ * string literal x 38,564,796 ops/sec ±1.15% (79 runs sampled)
+ * boolean literal x 31,148,940 ops/sec ±1.10% (79 runs sampled)
+ * number literal x 32,679,330 ops/sec ±1.90% (78 runs sampled)
+ * undefined x 32,363,368 ops/sec ±1.07% (82 runs sampled)
+ * function x 31,296,870 ops/sec ±0.96% (83 runs sampled)
+ */
+ var typeofObj = typeof obj;
+ if (typeofObj !== 'object') {
+ return typeofObj;
+ }
+
+ /* ! Speed optimisation
+ * Pre:
+ * null x 28,645,765 ops/sec ±1.17% (82 runs sampled)
+ * Post:
+ * null x 36,428,962 ops/sec ±1.37% (84 runs sampled)
+ */
+ if (obj === null) {
+ return 'null';
+ }
+
+ /* ! Spec Conformance
+ * Test: `Object.prototype.toString.call(window)``
+ * - Node === "[object global]"
+ * - Chrome === "[object global]"
+ * - Firefox === "[object Window]"
+ * - PhantomJS === "[object Window]"
+ * - Safari === "[object Window]"
+ * - IE 11 === "[object Window]"
+ * - IE Edge === "[object Window]"
+ * Test: `Object.prototype.toString.call(this)``
+ * - Chrome Worker === "[object global]"
+ * - Firefox Worker === "[object DedicatedWorkerGlobalScope]"
+ * - Safari Worker === "[object DedicatedWorkerGlobalScope]"
+ * - IE 11 Worker === "[object WorkerGlobalScope]"
+ * - IE Edge Worker === "[object WorkerGlobalScope]"
+ */
+ if (obj === globalObject) {
+ return 'global';
+ }
+
+ /* ! Speed optimisation
+ * Pre:
+ * array literal x 2,888,352 ops/sec ±0.67% (82 runs sampled)
+ * Post:
+ * array literal x 22,479,650 ops/sec ±0.96% (81 runs sampled)
+ */
+ if (
+ Array.isArray(obj) &&
+ (symbolToStringTagExists === false || !(Symbol.toStringTag in obj))
+ ) {
+ return 'Array';
+ }
+
+ // Not caching existence of `window` and related properties due to potential
+ // for `window` to be unset before tests in quasi-browser environments.
+ if (typeof window === 'object' && window !== null) {
+ /* ! Spec Conformance
+ * (https://html.spec.whatwg.org/multipage/browsers.html#location)
+ * WhatWG HTML$7.7.3 - The `Location` interface
+ * Test: `Object.prototype.toString.call(window.location)``
+ * - IE <=11 === "[object Object]"
+ * - IE Edge <=13 === "[object Object]"
+ */
+ if (typeof window.location === 'object' && obj === window.location) {
+ return 'Location';
+ }
+
+ /* ! Spec Conformance
+ * (https://html.spec.whatwg.org/#document)
+ * WhatWG HTML$3.1.1 - The `Document` object
+ * Note: Most browsers currently adher to the W3C DOM Level 2 spec
+ * (https://www.w3.org/TR/DOM-Level-2-HTML/html.html#ID-26809268)
+ * which suggests that browsers should use HTMLTableCellElement for
+ * both TD and TH elements. WhatWG separates these.
+ * WhatWG HTML states:
+ * > For historical reasons, Window objects must also have a
+ * > writable, configurable, non-enumerable property named
+ * > HTMLDocument whose value is the Document interface object.
+ * Test: `Object.prototype.toString.call(document)``
+ * - Chrome === "[object HTMLDocument]"
+ * - Firefox === "[object HTMLDocument]"
+ * - Safari === "[object HTMLDocument]"
+ * - IE <=10 === "[object Document]"
+ * - IE 11 === "[object HTMLDocument]"
+ * - IE Edge <=13 === "[object HTMLDocument]"
+ */
+ if (typeof window.document === 'object' && obj === window.document) {
+ return 'Document';
+ }
+
+ if (typeof window.navigator === 'object') {
+ /* ! Spec Conformance
+ * (https://html.spec.whatwg.org/multipage/webappapis.html#mimetypearray)
+ * WhatWG HTML$8.6.1.5 - Plugins - Interface MimeTypeArray
+ * Test: `Object.prototype.toString.call(navigator.mimeTypes)``
+ * - IE <=10 === "[object MSMimeTypesCollection]"
+ */
+ if (typeof window.navigator.mimeTypes === 'object' &&
+ obj === window.navigator.mimeTypes) {
+ return 'MimeTypeArray';
+ }
+
+ /* ! Spec Conformance
+ * (https://html.spec.whatwg.org/multipage/webappapis.html#pluginarray)
+ * WhatWG HTML$8.6.1.5 - Plugins - Interface PluginArray
+ * Test: `Object.prototype.toString.call(navigator.plugins)``
+ * - IE <=10 === "[object MSPluginsCollection]"
+ */
+ if (typeof window.navigator.plugins === 'object' &&
+ obj === window.navigator.plugins) {
+ return 'PluginArray';
+ }
+ }
+
+ if ((typeof window.HTMLElement === 'function' ||
+ typeof window.HTMLElement === 'object') &&
+ obj instanceof window.HTMLElement) {
+ /* ! Spec Conformance
+ * (https://html.spec.whatwg.org/multipage/webappapis.html#pluginarray)
+ * WhatWG HTML$4.4.4 - The `blockquote` element - Interface `HTMLQuoteElement`
+ * Test: `Object.prototype.toString.call(document.createElement('blockquote'))``
+ * - IE <=10 === "[object HTMLBlockElement]"
+ */
+ if (obj.tagName === 'BLOCKQUOTE') {
+ return 'HTMLQuoteElement';
+ }
+
+ /* ! Spec Conformance
+ * (https://html.spec.whatwg.org/#htmltabledatacellelement)
+ * WhatWG HTML$4.9.9 - The `td` element - Interface `HTMLTableDataCellElement`
+ * Note: Most browsers currently adher to the W3C DOM Level 2 spec
+ * (https://www.w3.org/TR/DOM-Level-2-HTML/html.html#ID-82915075)
+ * which suggests that browsers should use HTMLTableCellElement for
+ * both TD and TH elements. WhatWG separates these.
+ * Test: Object.prototype.toString.call(document.createElement('td'))
+ * - Chrome === "[object HTMLTableCellElement]"
+ * - Firefox === "[object HTMLTableCellElement]"
+ * - Safari === "[object HTMLTableCellElement]"
+ */
+ if (obj.tagName === 'TD') {
+ return 'HTMLTableDataCellElement';
+ }
+
+ /* ! Spec Conformance
+ * (https://html.spec.whatwg.org/#htmltableheadercellelement)
+ * WhatWG HTML$4.9.9 - The `td` element - Interface `HTMLTableHeaderCellElement`
+ * Note: Most browsers currently adher to the W3C DOM Level 2 spec
+ * (https://www.w3.org/TR/DOM-Level-2-HTML/html.html#ID-82915075)
+ * which suggests that browsers should use HTMLTableCellElement for
+ * both TD and TH elements. WhatWG separates these.
+ * Test: Object.prototype.toString.call(document.createElement('th'))
+ * - Chrome === "[object HTMLTableCellElement]"
+ * - Firefox === "[object HTMLTableCellElement]"
+ * - Safari === "[object HTMLTableCellElement]"
+ */
+ if (obj.tagName === 'TH') {
+ return 'HTMLTableHeaderCellElement';
+ }
+ }
+ }
+
+ /* ! Speed optimisation
+ * Pre:
+ * Float64Array x 625,644 ops/sec ±1.58% (80 runs sampled)
+ * Float32Array x 1,279,852 ops/sec ±2.91% (77 runs sampled)
+ * Uint32Array x 1,178,185 ops/sec ±1.95% (83 runs sampled)
+ * Uint16Array x 1,008,380 ops/sec ±2.25% (80 runs sampled)
+ * Uint8Array x 1,128,040 ops/sec ±2.11% (81 runs sampled)
+ * Int32Array x 1,170,119 ops/sec ±2.88% (80 runs sampled)
+ * Int16Array x 1,176,348 ops/sec ±5.79% (86 runs sampled)
+ * Int8Array x 1,058,707 ops/sec ±4.94% (77 runs sampled)
+ * Uint8ClampedArray x 1,110,633 ops/sec ±4.20% (80 runs sampled)
+ * Post:
+ * Float64Array x 7,105,671 ops/sec ±13.47% (64 runs sampled)
+ * Float32Array x 5,887,912 ops/sec ±1.46% (82 runs sampled)
+ * Uint32Array x 6,491,661 ops/sec ±1.76% (79 runs sampled)
+ * Uint16Array x 6,559,795 ops/sec ±1.67% (82 runs sampled)
+ * Uint8Array x 6,463,966 ops/sec ±1.43% (85 runs sampled)
+ * Int32Array x 5,641,841 ops/sec ±3.49% (81 runs sampled)
+ * Int16Array x 6,583,511 ops/sec ±1.98% (80 runs sampled)
+ * Int8Array x 6,606,078 ops/sec ±1.74% (81 runs sampled)
+ * Uint8ClampedArray x 6,602,224 ops/sec ±1.77% (83 runs sampled)
+ */
+ var stringTag = (symbolToStringTagExists && obj[Symbol.toStringTag]);
+ if (typeof stringTag === 'string') {
+ return stringTag;
+ }
+
+ var objPrototype = Object.getPrototypeOf(obj);
+ /* ! Speed optimisation
+ * Pre:
+ * regex literal x 1,772,385 ops/sec ±1.85% (77 runs sampled)
+ * regex constructor x 2,143,634 ops/sec ±2.46% (78 runs sampled)
+ * Post:
+ * regex literal x 3,928,009 ops/sec ±0.65% (78 runs sampled)
+ * regex constructor x 3,931,108 ops/sec ±0.58% (84 runs sampled)
+ */
+ if (objPrototype === RegExp.prototype) {
+ return 'RegExp';
+ }
+
+ /* ! Speed optimisation
+ * Pre:
+ * date x 2,130,074 ops/sec ±4.42% (68 runs sampled)
+ * Post:
+ * date x 3,953,779 ops/sec ±1.35% (77 runs sampled)
+ */
+ if (objPrototype === Date.prototype) {
+ return 'Date';
+ }
+
+ /* ! Spec Conformance
+ * (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-promise.prototype-@@tostringtag)
+ * ES6$25.4.5.4 - Promise.prototype[@@toStringTag] should be "Promise":
+ * Test: `Object.prototype.toString.call(Promise.resolve())``
+ * - Chrome <=47 === "[object Object]"
+ * - Edge <=20 === "[object Object]"
+ * - Firefox 29-Latest === "[object Promise]"
+ * - Safari 7.1-Latest === "[object Promise]"
+ */
+ if (promiseExists && objPrototype === Promise.prototype) {
+ return 'Promise';
+ }
+
+ /* ! Speed optimisation
+ * Pre:
+ * set x 2,222,186 ops/sec ±1.31% (82 runs sampled)
+ * Post:
+ * set x 4,545,879 ops/sec ±1.13% (83 runs sampled)
+ */
+ if (setExists && objPrototype === Set.prototype) {
+ return 'Set';
+ }
+
+ /* ! Speed optimisation
+ * Pre:
+ * map x 2,396,842 ops/sec ±1.59% (81 runs sampled)
+ * Post:
+ * map x 4,183,945 ops/sec ±6.59% (82 runs sampled)
+ */
+ if (mapExists && objPrototype === Map.prototype) {
+ return 'Map';
+ }
+
+ /* ! Speed optimisation
+ * Pre:
+ * weakset x 1,323,220 ops/sec ±2.17% (76 runs sampled)
+ * Post:
+ * weakset x 4,237,510 ops/sec ±2.01% (77 runs sampled)
+ */
+ if (weakSetExists && objPrototype === WeakSet.prototype) {
+ return 'WeakSet';
+ }
+
+ /* ! Speed optimisation
+ * Pre:
+ * weakmap x 1,500,260 ops/sec ±2.02% (78 runs sampled)
+ * Post:
+ * weakmap x 3,881,384 ops/sec ±1.45% (82 runs sampled)
+ */
+ if (weakMapExists && objPrototype === WeakMap.prototype) {
+ return 'WeakMap';
+ }
+
+ /* ! Spec Conformance
+ * (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-dataview.prototype-@@tostringtag)
+ * ES6$24.2.4.21 - DataView.prototype[@@toStringTag] should be "DataView":
+ * Test: `Object.prototype.toString.call(new DataView(new ArrayBuffer(1)))``
+ * - Edge <=13 === "[object Object]"
+ */
+ if (dataViewExists && objPrototype === DataView.prototype) {
+ return 'DataView';
+ }
+
+ /* ! Spec Conformance
+ * (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%mapiteratorprototype%-@@tostringtag)
+ * ES6$23.1.5.2.2 - %MapIteratorPrototype%[@@toStringTag] should be "Map Iterator":
+ * Test: `Object.prototype.toString.call(new Map().entries())``
+ * - Edge <=13 === "[object Object]"
+ */
+ if (mapExists && objPrototype === mapIteratorPrototype) {
+ return 'Map Iterator';
+ }
+
+ /* ! Spec Conformance
+ * (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%setiteratorprototype%-@@tostringtag)
+ * ES6$23.2.5.2.2 - %SetIteratorPrototype%[@@toStringTag] should be "Set Iterator":
+ * Test: `Object.prototype.toString.call(new Set().entries())``
+ * - Edge <=13 === "[object Object]"
+ */
+ if (setExists && objPrototype === setIteratorPrototype) {
+ return 'Set Iterator';
+ }
+
+ /* ! Spec Conformance
+ * (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%arrayiteratorprototype%-@@tostringtag)
+ * ES6$22.1.5.2.2 - %ArrayIteratorPrototype%[@@toStringTag] should be "Array Iterator":
+ * Test: `Object.prototype.toString.call([][Symbol.iterator]())``
+ * - Edge <=13 === "[object Object]"
+ */
+ if (arrayIteratorExists && objPrototype === arrayIteratorPrototype) {
+ return 'Array Iterator';
+ }
+
+ /* ! Spec Conformance
+ * (http://www.ecma-international.org/ecma-262/6.0/index.html#sec-%stringiteratorprototype%-@@tostringtag)
+ * ES6$21.1.5.2.2 - %StringIteratorPrototype%[@@toStringTag] should be "String Iterator":
+ * Test: `Object.prototype.toString.call(''[Symbol.iterator]())``
+ * - Edge <=13 === "[object Object]"
+ */
+ if (stringIteratorExists && objPrototype === stringIteratorPrototype) {
+ return 'String Iterator';
+ }
+
+ /* ! Speed optimisation
+ * Pre:
+ * object from null x 2,424,320 ops/sec ±1.67% (76 runs sampled)
+ * Post:
+ * object from null x 5,838,000 ops/sec ±0.99% (84 runs sampled)
+ */
+ if (objPrototype === null) {
+ return 'Object';
+ }
+
+ return Object
+ .prototype
+ .toString
+ .call(obj)
+ .slice(toStringLeftSliceLength, toStringRightSliceLength);
+}
+
+return typeDetect;
+
+})));
+
+},{}]},{},[1])(1)
+});
fnp / redakcja.git / blobdiff