X-Git-Url: https://git.mdrn.pl/fnpeditor.git/blobdiff_plain/2a317c49f0b5110cc3717878a4f988aba8c63c5e..241b81fd2cf4854b7f21f4c36b311798b2571ede:/src/smartxml/smartxml.test.js

diff --git a/src/smartxml/smartxml.test.js b/src/smartxml/smartxml.test.js
index c7cb6ad..f506f09 100644
--- a/src/smartxml/smartxml.test.js
+++ b/src/smartxml/smartxml.test.js
@@ -1,8 +1,9 @@
 define([
     'libs/chai',
     'libs/sinon',
+    'libs/underscore',
     './smartxml.js'
-], function(chai, sinon, smartxml) {
+], function(chai, sinon, _, smartxml) {
     
 'use strict';
 /*jshint expr:true */
@@ -59,6 +60,33 @@ describe('smartxml', function() {
             expect(emptyTextNode.getText()).to.equal('', 'empty ok');
             expect(nonEmptyTextNode.getText()).to.equal('alice', 'non empty ok');
         });
+
+        it('creates nodes from xml strings', function() {
+            var doc = getDocumentFromXML('<div></div>'),
+                node = doc.createDocumentNode('<a>Alice<b></b></a>');
+            expect(node.getTagName()).to.equal('a');
+            expect(node.contents().length).to.equal(2);
+            expect(node.contents()[0].getText()).to.equal('Alice');
+            expect(node.contents()[1].getTagName()).to.equal('b');
+        });
+
+        describe('Retrieving node by path', function() {
+            it('passes smoke tests', function() {
+                var doc = getDocumentFromXML('<root><a><b>c</b></a>');
+                expect(doc.getNodeByPath([0]).sameNode(doc.root.contents()[0])).to.be.true;
+                expect(doc.getNodeByPath([0,0]).sameNode(doc.root.contents()[0].contents()[0])).to.be.true;
+            });
+            it('treats empty path as a root path', function() {
+                var doc = getDocumentFromXML('<root></root>');
+                expect(doc.getNodeByPath([]).sameNode(doc.root)).to.be.true;
+            });
+            it('returns undefined for non existing paths', function() {
+                var doc = getDocumentFromXML('<root><a></a></root>');
+                expect(doc.getNodeByPath([1])).to.be.undefined;
+                expect(doc.getNodeByPath([0,1])).to.be.undefined;
+                expect(doc.getNodeByPath([10,1])).to.be.undefined;
+            });
+        });
     });
 
     describe('DocumentNode', function() {
@@ -76,6 +104,36 @@ describe('smartxml', function() {
             });
         });
 
+        it('can be cloned with its contents and its contents data', function() {
+            var doc = getDocumentFromXML('<root><div>text</div></root>'),
+                root = doc.root,
+                div = root.contents()[0],
+                text = div.contents()[0];
+
+            var ClonableObject = function(arg) {
+                this.arg = arg;
+            };
+            ClonableObject.prototype.clone = function() {
+                return new ClonableObject(this.arg);
+            };
+
+            div.setData('key', 'value');
+            div.setData('clonableObject', new ClonableObject('test'));
+            text.setData('key', 'value');
+
+            var rootClone = root.clone(),
+                divClone = rootClone.contents()[0],
+                textClone = divClone.contents()[0],
+                stringClone = divClone.getData('key'),
+                objClone = divClone.getData('clonableObject');
+
+            expect(stringClone).to.equal('value');
+            expect(objClone.arg).to.equal('test', 'clonable object got copied');
+            expect(objClone !== div.getData('clonableObject')).to.be.equal(true, 'copy of the clonable object is a new object');
+
+            expect(textClone.getData('key')).to.be.equal(undefined, 'cloning text node data is not supported yet');
+        });
+
         it('knows its path in the document tree', function() {
             var doc = getDocumentFromXML('<root><a><b><c></c>text</b></a></root>'),
                 root = doc.root,
@@ -128,46 +186,28 @@ describe('smartxml', function() {
                 node.setData({key1: 'value1', key2: 'value2'});
                 expect(node.getData()).to.eql({key1: 'value1', key2: 'value2'});
             });
+
+            it('can remove specific data', function() {
+                node.setData('key', 'value');
+                node.setData('key', undefined);
+                expect(node.getData('key')).to.be.undefined;
+            });
         });
 
         describe('Changing node tag', function() {
 
             it('can change tag name', function() {
                 var node = elementNodeFromXML('<div></div>');
-                node.setTag('span');
+                node = node.setTag('span');
                 expect(node.getTagName()).to.equal('span');
             });
 
-            it('emits nodeTagChange event', function() {
-                var node = elementNodeFromXML('<div></div>'),
-                    spy = sinon.spy();
-
-                node.document.on('change', spy);
-                node.setTag('span');
-                var event = spy.args[0][0];
-
-                expect(event.type).to.equal('nodeTagChange');
-                expect(event.meta.node.sameNode(node)).to.be.true;
-                expect(event.meta.oldTagName).to.equal('div');
-            });
-
             describe('Implementation specific expectations', function() {
-                // DOM specifies ElementNode tag as a read-only property, so
-                // changing it in a seamless way is a little bit tricky. For this reason
-                // the folowing expectations are required, despite the fact that they actually are
-                // motivated by implemetation details.
-
-                it('keeps node in the document', function() {
-                    var doc = getDocumentFromXML('<div><header></header></div>'),
-                        header = doc.root.contents()[0];
-                    header.setTag('span');
-                    expect(header.parent().sameNode(doc.root)).to.be.true;
-                });
                 it('keeps custom data', function() {
                     var node = elementNodeFromXML('<div></div>');
 
                     node.setData('key', 'value');
-                    node.setTag('header');
+                    node = node.setTag('header');
                     
                     expect(node.getTagName()).to.equal('header');
                     expect(node.getData()).to.eql({key: 'value'});
@@ -179,12 +219,13 @@ describe('smartxml', function() {
                     expect(doc.root.getTagName()).to.equal('span');
                 });
 
-                it('keeps contents', function() {
+                it('keeps node contents', function() {
                     var node = elementNodeFromXML('<div><div></div></div>');
-                    node.setTag('header');
+                    node = node.setTag('header');
                     expect(node.contents()).to.have.length(1);
                 });
             });
+        });
 
         describe('Setting node attributes', function() {
             it('can set node attribute', function() {
@@ -208,6 +249,42 @@ describe('smartxml', function() {
             });
         });
 
+        describe('Searching for the last child text node', function() {
+            [
+                '<div>xxx<div></div>last</div>',
+                '<div><div>last</div></div>',
+                '<div>xxx<div>last</div><div></div></div>'
+            ].forEach(function(xml, i) {
+                var example = 'example ' + i;
+                it('returns last child text node ' + example + ')', function() {
+                    var doc = getDocumentFromXML(xml),
+                        lastTextNode = doc.root.getLastTextNode();
+                    expect(lastTextNode.getText()).to.equal('last', example);
+                });
+            });
+        });
+
+        describe('Putting nodes around', function() {
+            it('will not allow to put node before or after root node', function() {
+                var doc = getDocumentFromXML('<root></root>'),
+                    spy = sinon.spy(),
+                    root = doc.root,
+                    result;
+
+                doc.on('change', spy);
+
+                result = doc.root.before({tagName: 'test'});
+
+                expect(spy.callCount).to.equal(0);
+                expect(result).to.undefined;
+
+                result = doc.root.after({tagName: 'test'});
+                
+                expect(spy.callCount).to.equal(0);
+                expect(result).to.undefined;
+
+                expect(doc.root.sameNode(root));
+            });
         });
     });
 
@@ -300,10 +377,65 @@ describe('smartxml', function() {
             });
         });
 
+        describe('Dividing text node into two with element node', function() {
+                it('can divide text node with element node, splitting text node into two', function() {
+                    var doc = getDocumentFromXML('<div>Alice has a cat</div>'),
+                        text = doc.root.contents()[0];
+
+                    var returned = text.divideWithElementNode({tagName: 'aside'}, {offset: 5}),
+                        contents = doc.root.contents(),
+                        lhsText = contents[0],
+                        rhsText = contents[2];
+
+                    expect(lhsText.getText()).to.equal('Alice');
+                    expect(returned.sameNode(contents[1]));
+                    expect(rhsText.getText()).to.equal(' has a cat');
+                });
+
+                it('treats dividing at the very end as appending after it', function() {
+                    var doc = getDocumentFromXML('<div>Alice has a cat</div>'),
+                        text = doc.root.contents()[0];
+
+
+                    var returned = text.divideWithElementNode({tagName: 'aside'}, {offset: 15}),
+                        contents = doc.root.contents(),
+                        textNode = contents[0],
+                        elementNode = contents[1];
+
+                    expect(contents.length).to.equal(2);
+                    expect(textNode.getText()).to.equal('Alice has a cat');
+                    expect(returned.sameNode(elementNode)).to.be.true;
+                    expect(elementNode.getTagName()).to.equal('aside');
+                });
+
+                it('treats dividing at the very beginning as prepending before it', function() {
+                    var doc = getDocumentFromXML('<div>Alice has a cat</div>'),
+                        text = doc.root.contents()[0];
+
+                    var returned = text.divideWithElementNode({tagName: 'aside'}, {offset: 0}),
+                        contents = doc.root.contents(),
+                        textNode = contents[1],
+                        elementNode = contents[0];
+
+                    expect(contents.length).to.equal(2);
+                    expect(textNode.getText()).to.equal('Alice has a cat');
+                    expect(returned.sameNode(elementNode)).to.be.true;
+                    expect(elementNode.getTagName()).to.equal('aside');
+                });
+        });
     });
 
     describe('Manipulations', function() {
 
+        describe('detaching nodes', function() {
+            it('can detach document root node', function() {
+                var doc = getDocumentFromXML('<div></div>');
+
+                doc.root.detach();
+                expect(doc.root).to.equal(null);
+            });
+        });
+
         describe('replacing node with another one', function() {
             it('replaces node with another one', function() {
                 var doc = getDocumentFromXML('<div><a></a></div>'),
@@ -336,6 +468,18 @@ describe('smartxml', function() {
             expect(rootContents[0].getText()).to.equal('Alice a cat');
         });
 
+        it('merges adjacent text nodes resulting from moving an element node in between', function() {
+            var doc = getDocumentFromXML('<div><a></a>Alice <span>has</span>a cat</div>'),
+                span = doc.root.contents()[2],
+                a = doc.root.contents()[0];
+
+            a.append(span);
+
+            var rootContents = doc.root.contents();
+            expect(rootContents).to.have.length(2, 'one child left');
+            expect(rootContents[1].getText()).to.equal('Alice a cat');
+        });
+
         it('inserts node at index', function() {
             var doc = getDocumentFromXML('<div><a></a><b></b><c></c></div>'),
                 b = doc.root.contents()[1];
@@ -377,12 +521,95 @@ describe('smartxml', function() {
             expect(node1.contents()[1].sameNode(node2)).to.be.true;
         });
 
-        it('wraps element node with another element node', function() {
+        describe('adding text nodes', function() {
+            it('merges text nodes on append', function() {
+                var doc = getDocumentFromXML('<root>text1</root>'),
+                    returned;
+                returned = doc.root.append({text: 'text2'});
+                expect(doc.root.contents().length).to.equal(1);
+                expect(returned.sameNode(doc.root.contents()[0])).to.equal(true, 'modified node returned');
+                expect(doc.root.contents()[0].getText()).to.equal('text1text2');
+            });
+
+            it('merges text nodes on prepend', function() {
+                var doc = getDocumentFromXML('<root>text1</root>'),
+                    returned;
+                returned = doc.root.prepend({text: 'text2'});
+                expect(doc.root.contents().length).to.equal(1);
+                expect(returned.sameNode(doc.root.contents()[0])).to.equal(true, 'modified node returned');
+                expect(doc.root.contents()[0].getText()).to.equal('text2text1');
+            });
+
+            it('merges text nodes on before text node', function() {
+                var doc = getDocumentFromXML('<root>text1</root>'),
+                    textNode = doc.root.contents()[0],
+                    returned;
+                returned = textNode.before({text: 'text2'});
+                expect(doc.root.contents().length).to.equal(1);
+                expect(returned.sameNode(doc.root.contents()[0])).to.equal(true, 'modified node returned');
+                expect(doc.root.contents()[0].getText()).to.equal('text2text1');
+            });
+
+            it('merges text nodes on after text node', function() {
+                var doc = getDocumentFromXML('<root>text1</root>'),
+                    textNode = doc.root.contents()[0],
+                    returned;
+                returned = textNode.after({text: 'text2'});
+                expect(doc.root.contents().length).to.equal(1);
+                expect(returned.sameNode(doc.root.contents()[0])).to.equal(true, 'modified node returned');
+                expect(doc.root.contents()[0].getText()).to.equal('text1text2');
+            });
+
+            it('merges text nodes on before element node', function() {
+                var doc = getDocumentFromXML('<root>text1<div></div></root>'),
+                    textNode = doc.root.contents()[0],
+                    div = doc.root.contents()[1],
+                    returned;
+                returned = div.before({text: 'text2'});
+                expect(doc.root.contents().length).to.equal(2);
+                expect(returned.sameNode(doc.root.contents()[0])).to.equal(true, 'modified node returned');
+                expect(textNode.getText()).to.equal('text1text2');
+            });
+
+            it('merges text nodes on after element node', function() {
+                var doc = getDocumentFromXML('<root><div></div>text1</root>'),
+                    textNode = doc.root.contents()[1],
+                    div = doc.root.contents()[0],
+                    returned;
+                returned = div.after({text: 'text2'});
+                expect(doc.root.contents().length).to.equal(2);
+                expect(returned.sameNode(doc.root.contents()[1])).to.equal(true, 'modified node returned');
+                expect(textNode.getText()).to.equal('text2text1');
+            });
+        });
+
+        it('wraps root element node with another element node', function() {
             var node = elementNodeFromXML('<div></div>'),
                 wrapper = elementNodeFromXML('<wrapper></wrapper>');
 
             node.wrapWith(wrapper);
             expect(node.parent().sameNode(wrapper)).to.be.true;
+            expect(node.document.root.sameNode(wrapper)).to.be.true;
+        });
+
+        it('wraps element node with another element node', function() {
+            var doc = getDocumentFromXML('<section><div></div></section>'),
+                div = doc.root.contents()[0];
+
+            var wrapper = div.wrapWith({tagName: 'wrapper'});
+            expect(wrapper.sameNode(doc.root.contents()[0])).to.equal(true, '1');
+            expect(div.parent().sameNode(wrapper)).to.equal(true, '2');
+            expect(wrapper.contents()[0].sameNode(div)).to.equal(true, '3');
+        });
+
+        it('wraps element outside of document tree', function() {
+            var doc = getDocumentFromXML('<section><div></div></section>'),
+                node = doc.createDocumentNode({tagName: 'node'});
+
+            node.wrapWith({tagName: 'wrapper'});
+            expect(node.parent().getTagName()).to.equal('wrapper');
+            expect(node.parent().contents()[0].sameNode(node)).to.be.true;
+            expect(doc.root.getTagName()).to.equal('section');
         });
 
         it('unwraps element node contents', function() {
@@ -397,6 +624,25 @@ describe('smartxml', function() {
             expect(node.contents()[2].getText()).to.equal(' a cat!');
         });
 
+        it('removes parent-describing sibling nodes of unwrapped node', function() {
+            var doc = getDocumentFromXML('<root><div><a></a><x></x><a></a></div></root>');
+
+            doc.registerExtension({documentNode: {methods: {
+                object: {
+                    describesParent: function() {
+                        return this.getTagName() === 'x';
+                    }
+                }
+            }}});
+
+            var div = doc.root.contents()[0],
+                x = div.contents()[1];
+
+            div.unwrapContent();
+            expect(doc.root.contents().length).to.equal(2);
+            expect(x.isInDocument()).to.be.false;
+        });
+
         it('unwrap single element node from its parent', function() {
             var doc = getDocumentFromXML('<div><a><b></b></a></div>'),
                 div = doc.root,
@@ -449,6 +695,33 @@ describe('smartxml', function() {
                 expect(wrapperContents[1].contents().length).to.equal(1);
                 expect(wrapperContents[1].contents()[0].getText()).to.equal('small');
             });
+
+            it('keeps parent-describing nodes in place', function() {
+                var doc = getDocumentFromXML('<root>Alice <x></x> probably <y></y> has a cat</root>');
+
+                doc.registerExtension({documentNode: {methods: {
+                    object: {
+                        describesParent: function() {
+                            /* globals Node */
+                            return this.nodeType === Node.ELEMENT_NODE && this.getTagName() === 'x';
+                        }
+                    }
+                }}});
+
+                var root = doc.root,
+                    x = root.contents()[1],
+                    y = root.contents()[3];
+
+                root.wrapText({
+                    _with: {tagName: 'span', attrs: {'attr1': 'value1'}},
+                    offsetStart: 1,
+                    offsetEnd: 4,
+                    textNodeIdx: [0,4]
+                });
+
+                expect(x.parent().sameNode(root)).to.be.true;
+                expect(y.parent().getTagName()).to.equal('span');
+            });
         });
 
         describe('Wrapping Nodes', function() {
@@ -497,10 +770,228 @@ describe('smartxml', function() {
                 expect(headerChildren[0].sameNode(div2)).to.equal(true, 'first node wrapped');
                 expect(headerChildren[1].sameNode(div3)).to.equal(true, 'second node wrapped');
             });
+
+            it('keeps parent-describing nodes in place', function() {
+                var section = elementNodeFromXML('<section>Alice<x></x><div>a cat</div></section>');
+
+                section.document.registerExtension({documentNode: {methods: {
+                    object: {
+                        describesParent: function() {
+                            return this.nodeType === Node.ELEMENT_NODE && this.getTagName() === 'x';
+                        }
+                    }
+                }}});
+
+                var aliceText = section.contents()[0],
+                    x = section.contents()[1],
+                    lastDiv = section.contents()[2];
+
+                section.document.wrapNodes({
+                        node1: aliceText,
+                        node2: lastDiv,
+                        _with: {tagName: 'header'}
+                    });
+
+                expect(x.parent().sameNode(section)).to.be.true;
+                expect(aliceText.parent().getTagName()).to.equal('header');
+                expect(lastDiv.parent().getTagName()).to.equal('header');
+            });
         });
 
     });
 
+    var getTextNodes = function(text, doc) {
+        /* globals Node */
+        var toret = [];
+        var search = function(node) {
+            node.contents().forEach(function(node) {
+                if(node.nodeType === Node.TEXT_NODE) {
+                    if(node.getText() === text) {
+                        toret.push(node);
+                    }
+                } else {
+                    search(node);
+                }
+            });
+        };
+        search(doc.root);
+        return toret;
+    };
+
+    var getTextNode = function(text, doc) {
+        var nodes = getTextNodes(text, doc),
+            error;
+        if(nodes.length === 0) {
+            error = 'Text not found';
+        } else if(nodes.length > 1) {
+            error = 'Text not unique';
+        } else if(nodes[0].getText() !== text) {
+            error = 'I was trying to cheat your test :(';
+        }
+        if(error) {
+            throw new Error(error);
+        }
+        return nodes[0];
+    };
+
+    describe('Removing arbitrary text', function() {
+        it('removes within single text element', function() {
+            var doc = getDocumentFromXML('<div>Alice</div>'),
+                text = getTextNode('Alice', doc);
+            doc.deleteText({
+                from: {
+                    node: text,
+                    offset: 1
+                },
+                to: {
+                    node: text,
+                    offset: 4
+                }
+            });
+            expect(doc.root.contents().length).to.equal(1);
+            expect(doc.root.contents()[0].getText()).to.equal('Ae');
+        });
+        it('removes across elements - 1', function() {
+            var doc = getDocumentFromXML('<div><a>aaa</a><b>bbb</b></div>');
+
+            doc.deleteText({
+                from: {
+                    node: getTextNode('aaa', doc),
+                    offset: 2
+                },
+                to: {
+                    node: getTextNode('bbb', doc),
+                    offset: 2
+                }
+            });
+
+            var contents = doc.root.contents();
+            expect(contents.length).to.equal(2);
+            expect(contents[0].contents()[0].getText()).to.equal('aa');
+            expect(contents[1].contents()[0].getText()).to.equal('b');
+        });
+        it('removes across elements - 2', function() {
+            var doc = getDocumentFromXML('<a><b><c>ccc</c></b>xxx</a>');
+            doc.deleteText({
+                from: {
+                    node: getTextNode('ccc', doc),
+                    offset: 2
+                },
+                to: {
+                    node: getTextNode('xxx', doc),
+                    offset: 2
+                }
+            });
+
+            var contents = doc.root.contents();
+            expect(contents.length).to.equal(2);
+            expect(contents[0].getTagName()).to.equal('b');
+            expect(contents[1].getText()).to.equal('x');
+            
+            var bContents = contents[0].contents();
+            expect(bContents.length).to.equal(1);
+            expect(bContents[0].getTagName()).to.equal('c');
+            expect(bContents[0].contents().length).to.equal(1);
+            expect(bContents[0].contents()[0].getText()).to.equal('cc');
+        });
+        it('remove across elements - 3 (merged text nodes)', function() {
+            var doc = getDocumentFromXML('<div>Alice <span>has</span> a cat</div>');
+            doc.deleteText({
+                from: {
+                    node: getTextNode('Alice ', doc),
+                    offset: 1
+                },
+                to: {
+                    node: getTextNode(' a cat', doc),
+                    offset: 3
+                }
+            });
+            var contents = doc.root.contents();
+            expect(contents.length).to.equal(1);
+            expect(contents[0].getText()).to.equal('Acat');
+        });
+        it('remove across elements - 4', function() {
+            var doc = getDocumentFromXML('<div>Alice <div>has <span>a</span> cat</div></div>');
+            doc.deleteText({
+                from: {
+                    node: getTextNode('Alice ', doc),
+                    offset: 1
+                },
+                to: {
+                    node: getTextNode(' cat', doc),
+                    offset: 1
+                }
+            });
+            var contents = doc.root.contents();
+            expect(contents.length).to.equal(2);
+            expect(contents[0].getText()).to.equal('A');
+            expect(contents[1].getTagName()).to.equal('div');
+            expect(contents[1].contents().length).to.equal(1);
+            expect(contents[1].contents()[0].getText()).to.equal('cat');
+        });
+        it('removes across elements - 5 (whole document)', function() {
+            var doc = getDocumentFromXML('<div>Alice <div>has <span>a</span> cat</div>!!!</div>');
+            doc.deleteText({
+                from: {
+                    node: getTextNode('Alice ', doc),
+                    offset: 0
+                },
+                to: {
+                    node: getTextNode('!!!', doc),
+                    offset: 3
+                }
+            });
+
+            expect(doc.root.getTagName()).to.equal('div');
+            expect(doc.root.contents().length).to.equal(1);
+            expect(doc.root.contents()[0].getText()).to.equal('');
+        });
+        it('removes nodes in between', function() {
+            var doc = getDocumentFromXML('<div><a>aaa<x>!</x></a>xxx<x></x><b><x>!</x>bbb</b></div>');
+            doc.deleteText({
+                from: {
+                    node: getTextNode('aaa', doc),
+                    offset: 2
+                },
+                to: {
+                    node: getTextNode('bbb', doc),
+                    offset: 2
+                }
+            });
+
+            var contents = doc.root.contents();
+            expect(contents.length).to.equal(2, 'two nodes survived');
+            expect(contents[0].getTagName()).to.equal('a');
+            expect(contents[1].getTagName()).to.equal('b');
+            expect(contents[0].contents().length).to.equal(1);
+            expect(contents[0].contents()[0].getText()).to.equal('aa');
+            expect(contents[1].contents().length).to.equal(1);
+            expect(contents[1].contents()[0].getText()).to.equal('b');
+        });
+        it('removes across elements - 6', function() {
+            var doc = getDocumentFromXML('<root><div>aaa<span>bbb</span>ccc</div><div>ddd</div></root>');
+            doc.deleteText({
+                from: {
+                    node: getTextNode('aaa', doc),
+                    offset: 1
+                },
+                to: {
+                    node: getTextNode('ddd', doc),
+                    offset: 1
+                }
+            }, {
+                error: function(e) {throw e;}
+            });
+
+            var contents = doc.root.contents();
+            expect(contents.length).to.equal(2);
+            expect(contents[0].contents().length).to.equal(1);
+            expect(contents[0].contents()[0].getText()).to.equal('a');
+            expect(contents[1].contents().length).to.equal(1);
+            expect(contents[1].contents()[0].getText()).to.equal('dd');
+        });
+    });
+
     describe('Splitting text', function() {
     
         it('splits TextNode\'s parent into two ElementNodes', function() {
@@ -606,7 +1097,7 @@ describe('smartxml', function() {
             expect(event.meta.node.sameNode(appended)).to.be.true;
         });
         
-        it('emits nodeMoved when appending aready existing node', function() {
+        it('emits nodeDetached/nodeAdded events with `move` flag when appending aready existing node', function() {
             var node = elementNodeFromXML('<div><a></a><b></b></div>'),
                 a = node.contents()[0],
                 b = node.contents()[1],
@@ -614,11 +1105,17 @@ describe('smartxml', function() {
             node.document.on('change', spy);
             
             var appended = a.append(b),
-                event = spy.args[0][0];
+                detachedEvent = spy.args[0][0],
+                addedEvent = spy.args[1][0];
+
+            expect(spy.callCount).to.equal(2);
+            expect(detachedEvent.type).to.equal('nodeDetached');
+            expect(detachedEvent.meta.node.sameNode(appended)).to.be.true;
+            expect(detachedEvent.meta.move).to.equal(true, 'move flag set to true for nodeDetachedEvent');
+            expect(addedEvent.type).to.equal('nodeAdded');
+            expect(addedEvent.meta.node.sameNode(appended)).to.be.true;
+            expect(addedEvent.meta.move).to.equal(true, 'move flag set to true for nodeAddedEvent');
 
-            expect(spy.callCount).to.equal(1);
-            expect(event.type).to.equal('nodeMoved');
-            expect(event.meta.node.sameNode(appended)).to.be.true;
         });
         
         it('emits nodeAdded event when prepending new node', function() {
@@ -632,18 +1129,24 @@ describe('smartxml', function() {
             expect(event.meta.node.sameNode(prepended)).to.be.true;
         });
         
-        it('emits nodeMoved when prepending aready existing node', function() {
+        it('emits nodeDetached/nodeAdded events with `move` flag when prepending aready existing node', function() {
             var node = elementNodeFromXML('<div><a></a><b></b></div>'),
                 a = node.contents()[0],
                 b = node.contents()[1],
                 spy = sinon.spy();
             node.document.on('change', spy);
-            
+
             var prepended = a.prepend(b),
-                event = spy.args[0][0];
-            expect(spy.callCount).to.equal(1);
-            expect(event.type).to.equal('nodeMoved');
-            expect(event.meta.node.sameNode(prepended)).to.be.true;
+                detachedEvent = spy.args[0][0],
+                addedEvent = spy.args[1][0];
+
+            expect(spy.callCount).to.equal(2);
+            expect(detachedEvent.type).to.equal('nodeDetached');
+            expect(detachedEvent.meta.node.sameNode(prepended)).to.be.true;
+            expect(detachedEvent.meta.move).to.equal(true, 'move flag set to true for nodeDetachedEvent');
+            expect(addedEvent.type).to.equal('nodeAdded');
+            expect(addedEvent.meta.node.sameNode(prepended)).to.be.true;
+            expect(addedEvent.meta.move).to.equal(true, 'move flag set to true for nodeAddedEvent');
         });
         
         it('emits nodeAdded event when inserting node after another', function() {
@@ -657,18 +1160,23 @@ describe('smartxml', function() {
             expect(event.meta.node.sameNode(inserted)).to.be.true;
         });
         
-        it('emits nodeMoved when inserting aready existing node after another', function() {
+        it('emits nodeDetached/nodeAdded events with `move` flag when inserting aready existing node after another', function() {
             var node = elementNodeFromXML('<div><a></a><b></b></div>'),
                 a = node.contents()[0],
                 b = node.contents()[1],
                 spy = sinon.spy();
             node.document.on('change', spy);
             var inserted = b.after(a),
-                event = spy.args[0][0];
+                detachedEvent = spy.args[0][0],
+                addedEvent = spy.args[1][0];
 
-            expect(spy.callCount).to.equal(1);
-            expect(event.type).to.equal('nodeMoved');
-            expect(event.meta.node.sameNode(inserted)).to.be.true;
+            expect(spy.callCount).to.equal(2);
+            expect(detachedEvent.type).to.equal('nodeDetached');
+            expect(detachedEvent.meta.node.sameNode(inserted)).to.be.true;
+            expect(detachedEvent.meta.move).to.equal(true, 'move flag set to true for nodeDetachedEvent');
+            expect(addedEvent.type).to.equal('nodeAdded');
+            expect(addedEvent.meta.node.sameNode(inserted)).to.be.true;
+            expect(addedEvent.meta.move).to.equal(true, 'move flag set to true for nodeAddedEvent');
         });
 
         it('emits nodeAdded event when inserting node before another', function() {
@@ -682,18 +1190,23 @@ describe('smartxml', function() {
             expect(event.meta.node.sameNode(inserted)).to.be.true;
         });
         
-        it('emits nodeAdded when inserting aready existing node before another', function() {
+        it('emits nodeDetached/nodeAdded events with `move` flag when inserting aready existing node before another', function() {
             var node = elementNodeFromXML('<div><a></a><b></b></div>'),
                 a = node.contents()[0],
                 b = node.contents()[1],
                 spy = sinon.spy();
             node.document.on('change', spy);
             var inserted = a.before(b),
-                event = spy.args[0][0];
+                detachedEvent = spy.args[0][0],
+                addedEvent = spy.args[1][0];
 
-            expect(spy.callCount).to.equal(1);
-            expect(event.type).to.equal('nodeMoved');
-            expect(event.meta.node.sameNode(inserted)).to.be.true;
+            expect(spy.callCount).to.equal(2);
+            expect(detachedEvent.type).to.equal('nodeDetached');
+            expect(detachedEvent.meta.node.sameNode(inserted)).to.be.true;
+            expect(detachedEvent.meta.move).to.equal(true, 'move flag set to true for nodeDetachedEvent');
+            expect(addedEvent.type).to.equal('nodeAdded');
+            expect(addedEvent.meta.node.sameNode(inserted)).to.be.true;
+            expect(addedEvent.meta.move).to.equal(true, 'move flag set to true for nodeAddedEvent');
         });
 
         it('emits nodeDetached and nodeAdded when replacing root node with another', function() {
@@ -735,15 +1248,14 @@ describe('smartxml', function() {
                 expect(event.meta.node.sameNode(a));
             });
 
-            it('doesn\'t emit nodeDetached event for already out of document moved to out of document node: ' + insertionMethod, function() {
+            it('doesn\'t emit nodeDetached event for already out of document node moved to out of document node' + insertionMethod, function() {
                 var doc = getDocumentFromXML('<div><a></a></div>'),
-                    a = doc.root.contents()[0],
                     spy = sinon.spy();
 
                 doc.on('change', spy);
 
                 var newNode = doc.createDocumentNode({tagName: 'b'});
-                    var newNodeInner = newNode.append({tagName:'c'});
+                newNode.append({tagName:'c'});
 
                 expect(spy.callCount).to.equal(0);
             });
@@ -769,7 +1281,9 @@ describe('smartxml', function() {
                     c = b.contents()[0];
 
                 var parents = c.parents();
-                expect(parents).to.eql([b,a]);
+                // @@
+                expect(parents[0].sameNode(b)).to.be.true;
+                expect(parents[1].sameNode(a)).to.be.true;
             });
         });
 
@@ -797,6 +1311,16 @@ describe('smartxml', function() {
                 expect(siblingParents.node1.sameNode(aliceText)).to.equal(true, 'aliceText');
                 expect(siblingParents.node2.sameNode(span)).to.equal(true, 'span');
             });
+
+            it('returns node itself for two same nodes', function() {
+                var doc = getDocumentFromXML('<section><div></div></section>'),
+                    div = doc.root.contents()[0];
+
+                var siblingParents = doc.getSiblingParents({node1: div, node2: div});
+                expect(!!siblingParents.node1 && !!siblingParents.node2).to.equal(true, 'nodes defined');
+                expect(siblingParents.node1.sameNode(div)).to.be.equal(true, 'node1');
+                expect(siblingParents.node2.sameNode(div)).to.be.equal(true, 'node2');
+            });
         });
     });
 
@@ -827,61 +1351,536 @@ describe('smartxml', function() {
         });
     });
 
-    describe('Undo/redo', function() {
+    describe('Extension API', function() {
+        var doc, extension, elementNode, textNode;
 
-        it('does work', function() {
-            var doc = getDocumentFromXML('<section><span>Alice</span></section>'),
-                span = doc.root.contents()[0];
+        beforeEach(function() {
+            doc = getDocumentFromXML('<section>Alice<div class="test_class"></div></section>');
+        });
 
-            span.transform('smartxml.detach');
+        it('allows adding method to a document', function() {
+            extension = {document: {methods: {
+                testMethod: function() { return this; }
+            }}};
 
+            doc.registerExtension(extension);
+            expect(doc.testMethod()).to.equal(doc, 'context is set to a document instance');
+        });
 
-            doc.undo();
+        it('allows adding transformation to a document', function() {
+            extension = {document: {transformations: {
+                testTransformation: function() { return this; },
+                testTransformation2: {impl: function() { return this;}}
+            }}};
+
+            doc.registerExtension(extension);
+            expect(doc.testTransformation()).to.equal(doc, 'context is set to a document instance');
+            expect(doc.testTransformation2()).to.equal(doc, 'context is set to a document instance');
+        });
+
+        it('allows adding method to a DocumentNode instance', function() {
+            extension = {
+                documentNode: {
+                    methods: {
+                        testMethod: function() { return this; }
+                    }
+                },
+                textNode: {
+                    methods: {
+                        textTestMethod: function() { return this; }
+                    }
+                },
+                elementNode: {
+                    methods: {
+                        elementTestMethod: function() { return this; }
+                    }
+                }
+            };
+
+            doc.registerExtension(extension);
+
+            elementNode = doc.root;
+            textNode = doc.root.contents()[0];
+
+            expect(elementNode.testMethod().sameNode(elementNode)).to.equal(true, 'context is set to a node instance');
+            expect(textNode.testMethod().sameNode(textNode)).to.equal(true, 'context is set to a node instance');
+
+            expect(elementNode.elementTestMethod().sameNode(elementNode)).to.be.true;
+            expect(elementNode.textTestMethod).to.be.undefined;
+        
+            expect(textNode.textTestMethod().sameNode(textNode)).to.be.true;
+            expect(textNode.elementTestMethod).to.be.undefined;
+        });
 
-            expect(doc.root.contents()).to.have.length(1);
-            expect(doc.root.contents()[0].getTagName()).to.equal('span');
-            expect(doc.root.contents()[0].contents()[0].getText()).to.equal('Alice');
+        it('allows adding transformation to a DocumentNode', function() {
+            extension = {
+                documentNode: {
+                    transformations: {
+                        testTransformation: function() { return this; },
+                        testTransformation2: {impl: function() { return this;}}
+                    }
+                },
+                textNode: {
+                    transformations: {
+                        textTestTransformation: function() { return this; }
+                    }
+                },
+                elementNode: {
+                    transformations: {
+                        elementTestTransformation: function() { return this; }
+                    }
+                }
+            };
+            
+            doc.registerExtension(extension);
+
+            elementNode = doc.root;
+            textNode = doc.root.contents()[0];
+            
+            expect(elementNode.testTransformation().sameNode(elementNode)).to.equal(true, '1');
+            expect(elementNode.testTransformation2().sameNode(elementNode)).to.equal(true, '2');
+            expect(textNode.testTransformation().sameNode(textNode)).to.equal(true, '3');
+            expect(textNode.testTransformation2().sameNode(textNode)).to.equal(true, '4');
+
+            expect(elementNode.elementTestTransformation().sameNode(elementNode)).to.be.true;
+            expect(elementNode.textTestTransformation).to.be.undefined;
+        
+            expect(textNode.textTestTransformation().sameNode(textNode)).to.be.true;
+            expect(textNode.elementTestTransfomation).to.be.undefined;
+        });
+
+        it('allows text/element node methods and transformations to access node and transormations on document node', function() {
+
+            var doc = getDocumentFromXML('<div>text</div>');
+
+            doc.registerExtension({
+                documentNode: {
+                    methods: {
+                        test: function() {
+                            return 'super';
+                        }
+                    },
+                    transformations: {
+                        testT: function() {
+                            return 'super_trans';
+                        }
+                    }
+                },
+                elementNode: {
+                    methods: {
+                        test: function() {
+                            return 'element_sub_' + this.__super__.test();
+                        }
+                    },
+                    transformations: {
+                        testT: function() {
+                            return 'element_trans_sub_' + this.__super__.testT();
+                        }
+                    }
+                },
+                textNode: {
+                    methods: {
+                        test: function() {
+                            return 'text_sub_' + this.__super__.test();
+                        }
+                    },
+                    transformations: {
+                        testT: function() {
+                            return 'text_trans_sub_' + this.__super__.testT();
+                        }
+                    }
+                }
+            });
+
+            var textNode = doc.root.contents()[0];
+
+            expect(doc.root.test()).to.equal('element_sub_super');
+            expect(textNode.test()).to.equal('text_sub_super');
+            expect(doc.root.testT()).to.equal('element_trans_sub_super_trans');
+            expect(textNode.testT()).to.equal('text_trans_sub_super_trans');
+        });
+    });
+
+    describe('Undo/redo', function() {
+
+        it('smoke tests', function() {
+            var doc = getDocumentFromXML('<div>Alice</div>'),
+                textNode = doc.root.contents()[0];
+
+            expect(doc.undoStack).to.have.length(0);
+            
+            textNode.wrapWith({tagName: 'span', start:1, end:2});
+            expect(doc.undoStack).to.have.length(1, '1');
+            expect(doc.toXML()).to.equal('<div>A<span>l</span>ice</div>');
+
+            doc.undo();
+            expect(doc.undoStack).to.have.length(0, '2');
+            expect(doc.toXML()).to.equal('<div>Alice</div>');
 
             doc.redo();
-            expect(doc.root.contents()).to.have.length(0);
+            expect(doc.undoStack).to.have.length(1, '3');
+            expect(doc.toXML()).to.equal('<div>A<span>l</span>ice</div>');
 
             doc.undo();
-            expect(doc.root.contents()).to.have.length(1);
-            expect(doc.root.contents()[0].getTagName()).to.equal('span');
-            expect(doc.root.contents()[0].contents()[0].getText()).to.equal('Alice');
+            expect(doc.undoStack).to.have.length(0, '4');
+            expect(doc.toXML()).to.equal('<div>Alice</div>');
 
+            doc.undo();
+            expect(doc.undoStack).to.have.length(0, '5');
+            expect(doc.toXML()).to.equal('<div>Alice</div>');
         });
-        it('does work - merged text nodes case', function() {
-            var doc = getDocumentFromXML('<section>Alice <span>has</span> a cat.</section>'),
-                span = doc.root.contents()[1];
 
-            span.transform('smartxml.detach');
+        it('smoke tests 2', function() {
+            var doc = getDocumentFromXML('<div>Alice</div>'),
+                textNode = doc.root.contents()[0],
+                path = textNode.getPath();
+
+            textNode.setText('Alice ');
+            textNode.setText('Alice h');
+            textNode.setText('Alice ha');
+            textNode.setText('Alice has');
 
+            expect(textNode.getText()).to.equal('Alice has');
 
             doc.undo();
+            expect(doc.root.contents()[0].getText()).to.equal('Alice ha', '1');
 
-            expect(doc.root.contents().length).to.equal(3);
-            //console.log(doc.toXML());
-            expect(doc.root.contents()[1].contents()[0].getText()).to.equal('has');
+            doc.undo();
+            expect(doc.root.contents()[0].getText()).to.equal('Alice h', '2');
 
+            doc.redo();
+            expect(doc.root.contents()[0].getText()).to.equal('Alice ha', '3');
+
+            doc.redo();
+            expect(doc.root.contents()[0].getText()).to.equal('Alice has', '4');
+
+            doc.undo();
+            doc.undo();
+            textNode = doc.getNodeByPath(path);
+            textNode.setText('Cat');
+            doc.undo();
+            textNode = doc.getNodeByPath(path);
+            expect(textNode.getText()).to.equal('Alice h');
         });
-        it('dbg - don not store nodes in tranformation state!', function() {
-            var doc = getDocumentFromXML('<section><a></a><b></b></section>'),
-                a = doc.root.contents()[0],
-                b = doc.root.contents()[1];
 
-            a.transform('smartxml.detach');
-            b.transform('smartxml.detach');
+        
+        var sampleMethod = function(val) {
+            this._$.attr('x', val);
+            this.triggerChangeEvent();
+        };
+
+        var transformations = {
+            'unaware': sampleMethod,
+            'returning change root': {
+                impl: sampleMethod,
+                getChangeRoot: function() {
+                    return this.context;
+                }
+            },
+            'implementing undo operation': {
+                impl: function(t, val) {
+                    t.oldVal = this.getAttr('x');
+                    sampleMethod.call(this, val);
+                },
+                undo: function(t) {
+                    this.setAttr('x', t.oldVal);
+                }
+            }
+        };
+
+        _.pairs(transformations).forEach(function(pair) {
+            var name = pair[0],
+                transformaton = pair[1];
+
+            describe(name + ' transformation: ', function() {
+                var doc, node, nodePath;
+
+                beforeEach(function() {
+                    doc = getDocumentFromXML('<div><test x="old"></test></div>');
+
+                    doc.registerExtension({elementNode: {transformations: {
+                        test: transformaton
+                    }}});
+
+                    node = doc.root.contents()[0];
+                    nodePath = node.getPath();
+                });
+
+                it('transforms as expected', function() {
+                    node.test('new');
+                    expect(node.getAttr('x')).to.equal('new');
+                });
+
+                it('can be undone', function() {
+                    node.test('new');
+                    doc.undo();
+                    node = doc.getNodeByPath(nodePath);
+                    expect(node.getAttr('x')).to.equal('old');
+                });
+
+                it('can be undone and then redone', function() {
+                    node.test('new');
+                    doc.undo();
+                    doc.redo();
+                    node = doc.getNodeByPath(nodePath);
+                    expect(node.getAttr('x')).to.equal('new');
+                });
+
+                it('handles a sample scenario', function() {
+                    doc.root.contents()[0].test('1');
+                    doc.root.contents()[0].test('2');
+                    doc.root.contents()[0].test('3');
+                    doc.root.contents()[0].test('4');
+                    doc.root.contents()[0].test('5');
+
+                    expect(doc.root.contents()[0].getAttr('x')).to.equal('5', 'after initial transformations');
+                    doc.undo();
+                    expect(doc.root.contents()[0].getAttr('x')).to.equal('4', 'undo 1.1');
+                    doc.undo();
+                    expect(doc.root.contents()[0].getAttr('x')).to.equal('3', 'undo 1.2');
+                    doc.redo();
+                    expect(doc.root.contents()[0].getAttr('x')).to.equal('4', 'redo 1.1');
+                    doc.redo();
+                    expect(doc.root.contents()[0].getAttr('x')).to.equal('5', 'redo 1.2');
+                    doc.undo();
+                    expect(doc.root.contents()[0].getAttr('x')).to.equal('4', 'undo 2.1');
+                    doc.root.contents()[0].test('10');
+                    expect(doc.root.contents()[0].getAttr('x')).to.equal('10', 'additional transformation');
+                    expect(doc.redoStack.length).to.equal(0, 'transformation cleared redo stack');
+                    doc.redo();
+                    expect(doc.root.contents()[0].getAttr('x')).to.equal('10', 'empty redoStack so redo was noop');
+                    doc.undo();
+                    expect(doc.root.contents()[0].getAttr('x')).to.equal('4', 'undoing additional transformation');
+                    doc.redo();
+                    expect(doc.root.contents()[0].getAttr('x')).to.equal('10', 'redoing additional transformation');
+                });
+            });
+        });
+
+        it('smoke tests nested transformations', function() {
+            var doc = getDocumentFromXML('<div></div>');
+
+            doc.registerExtension({elementNode: {transformations: {
+                nested: function(v) {
+                    this._$.attr('innerAttr', v);
+                    this.triggerChangeEvent();
+                },
+                outer: function(v) {
+                    this.nested(v);
+                    this._$.attr('outerAttr', v);
+                    this.triggerChangeEvent();
+                }
+            }}});
+
+            doc.root.outer('test1');
+            doc.root.outer('test2');
+
+            expect(doc.root.getAttr('innerAttr')).to.equal('test2');
+            expect(doc.root.getAttr('outerAttr')).to.equal('test2');
+
             doc.undo();
+
+            expect(doc.root.getAttr('innerAttr')).to.equal('test1');
+            expect(doc.root.getAttr('outerAttr')).to.equal('test1');
+
             doc.undo();
-            expect(doc.root.contents().length).to.equal(2);
-            expect(doc.root.contents()[0].getTagName()).to.equal('a');
-            expect(doc.root.contents()[1].getTagName()).to.equal('b');
+
+            expect(doc.root.getAttr('innerAttr')).to.equal(undefined);
+            expect(doc.root.getAttr('outerAttr')).to.equal(undefined);
 
             doc.redo();
+
+            expect(doc.root.getAttr('innerAttr')).to.equal('test1');
+            expect(doc.root.getAttr('outerAttr')).to.equal('test1');
+
             doc.redo();
-            expect(doc.root.contents().length).to.equal(0);
 
+            expect(doc.root.getAttr('innerAttr')).to.equal('test2');
+            expect(doc.root.getAttr('outerAttr')).to.equal('test2');
+
+        });
+
+        it('ignores transformation if document didn\'t emit change event', function() {
+            var doc = getDocumentFromXML('<div></div>');
+
+            doc.registerExtension({elementNode: {transformations: {
+                test: function() {
+                    // empty
+                }
+            }}});
+
+            doc.root.test();
+            expect(doc.undoStack.length).to.equal(0);
+
+        });
+
+        describe('Transactions', function() {
+            it('allows to undo/redo series of transformations at once', function() {
+                var doc = getDocumentFromXML('<div></div>');
+
+                doc.registerExtension({
+                    elementNode: {transformations: {
+                        test: function(v) {
+                            this.setAttr('test', v);
+                        }
+                    }}
+                });
+
+                doc.startTransaction();
+                doc.root.test('1');
+                doc.root.test('2');
+                doc.root.test('3');
+                doc.endTransaction();
+
+                doc.undo();
+                expect(doc.root.getAttr('test'), '1');
+                doc.redo();
+                expect(doc.root.getAttr('test'), '3');
+                doc.undo();
+                expect(doc.root.getAttr('test'), '1');
+                doc.redo();
+                expect(doc.root.getAttr('test'), '3');
+            });
+
+            it('ignores empty transactions', function() {
+                var doc = getDocumentFromXML('<div></div>');
+                doc.startTransaction();
+                doc.endTransaction();
+                expect(doc.undoStack).to.have.length(0, 'empty transaction doesn\'t get pushed into undo stack');
+            });
+
+            it('doesn\'t break on optimizations', function() {
+                // This is a smoke test checking if optimizations made to transaction undoing
+                // doesnt't break anything.
+                var doc = getDocumentFromXML('<div smart="1" unaware="1"></div>');
+
+                doc.registerExtension({
+                    elementNode: {transformations: {
+                        unaware: function(v) {
+                            this.setAttr('unware', v);
+                            this.triggerChangeEvent();
+                        },
+                        smart: {
+                            impl: function(t, v) {
+                                t.oldVal = this.getAttr('smart');
+                                this.setAttr('smart', v);
+                                this.triggerChangeEvent();
+                            },
+                            undo: function(t) {
+                                this.setAttr('smart', t.oldVal);
+                                this.triggerChangeEvent();
+                            }
+                        }
+                    }}
+                });
+
+                doc.startTransaction();
+                doc.root.smart('2');
+                doc.root.unaware('2');
+                doc.root.smart('3');
+                doc.root.unaware('3');
+                doc.endTransaction();
+
+                doc.undo();
+
+                expect(doc.root.getAttr('smart')).to.equal('1');
+                expect(doc.root.getAttr('unaware')).to.equal('1');
+            });
+
+            it('can have associated metadata', function() {
+                var doc = getDocumentFromXML('<div></div>'),
+                    metadata = Object.create({});
+
+                doc.registerExtension({document: {transformations: {
+                    test: function() {
+                        this.trigger('change');
+                    }
+                }}});
+
+                doc.startTransaction(metadata);
+                doc.test();
+                doc.endTransaction();
+
+                var transaction = doc.undoStack[0];
+                expect(transaction.metadata).to.equal(metadata);
+            });
+
+            it('can be rolled back', function() {
+                var doc = getDocumentFromXML('<root></root>');
+
+                doc.startTransaction();
+                doc.root.append({tagName: 'div'});
+                doc.rollbackTransaction();
+
+                expect(doc.undoStack.length).to.equal(0, 'nothing to undo');
+                expect(doc.root.contents().length).to.equal(0);
+            });
+
+            it('rollbacks and calls error handleor if error gets thrown', function() {
+                var doc = getDocumentFromXML('<root></root>'),
+                    err = new Error(),
+                    spy = sinon.spy();
+                
+                doc.transaction(function() {
+                    doc.root.append({tagName: 'div'});
+                    throw err;
+                }, {error: spy});
+
+                expect(spy.args[0][0]).to.equal(err);
+                expect(doc.root.contents().length).to.equal(0);
+                expect(doc.undoStack.length).to.equal(0);
+            });
+        });
+
+        describe('Regression tests', function() {
+            it('redos correctly after running its own undo followed by unaware transformation undo', function() {
+                var doc = getDocumentFromXML('<section t="0"></section>');
+                
+                doc.registerExtension({elementNode: {transformations: {
+                    unaware: function() {
+                        this.triggerChangeEvent();
+                    },
+                    test: {
+                        impl: function() {
+                            this._$.attr('t', 1);
+                            this.triggerChangeEvent();
+                        },
+                        undo: function() {
+                            this._$.attr('t', 0);
+                        }
+                    }
+                }}});
+                doc.root.unaware();
+                doc.root.test();
+                doc.undo();
+                doc.undo();
+                doc.redo();
+                doc.redo();
+                expect(doc.root.getAttr('t')).to.equal('1');
+            });
+            it('can perform undo of an operation performed after automatic transaction rollback', function() {
+                var doc = getDocumentFromXML('<section></section>'),
+                    extension = {document: {transformations: {
+                        throwingTransformation: function() { throw new Error(); }
+                    }}};
+
+                doc.registerExtension(extension);
+
+                doc.throwingTransformation();
+
+                doc.transaction(function() {
+                    doc.root.setAttr('x', '2');
+                });
+
+                expect(doc.undoStack.length).to.equal(1);
+                expect(doc.root.getAttr('x')).to.equal('2');
+
+                doc.undo();
+
+                expect(doc.undoStack.length).to.equal(0);
+                expect(doc.root.getAttr('x')).to.be.undefined;
+
+            });
         });
     });