+from nose.tools import raises
+from StringIO import StringIO
+
+class BasicSearchLogicTests(TestCase):
+
+    def setUp(self):
+        self.author_tag = models.Tag.objects.create(
+                                name=u'Adam Mickiewicz [SubWord]',
+                                category=u'author', slug="one")
+
+        self.unicode_tag = models.Tag.objects.create(
+                                name=u'Tadeusz Żeleński (Boy)',
+                                category=u'author', slug="two")
+
+        self.polish_tag = models.Tag.objects.create(
+                                name=u'ĘÓĄŚŁŻŹĆŃęóąśłżźćń',
+                                category=u'author', slug="three")
+
+    @raises(ValueError)
+    def test_empty_query(self):
+        """ Check that empty queries raise an error. """
+        views.find_best_matches(u'')
+
+    @raises(ValueError)
+    def test_one_letter_query(self):
+        """ Check that one letter queries aren't permitted. """
+        views.find_best_matches(u't')
+
+    def test_match_by_prefix(self):
+        """ Tags should be matched by prefix of words within it's name. """
+        self.assertEqual(views.find_best_matches(u'Ada'), (self.author_tag,))
+        self.assertEqual(views.find_best_matches(u'Mic'), (self.author_tag,))
+        self.assertEqual(views.find_best_matches(u'Mickiewicz'), (self.author_tag,))
+
+    def test_match_case_insensitive(self):
+        """ Tag names should match case insensitive. """
+        self.assertEqual(views.find_best_matches(u'adam mickiewicz'), (self.author_tag,))
+
+    def test_match_case_insensitive_unicode(self):
+        """ Tag names should match case insensitive (unicode). """
+        self.assertEqual(views.find_best_matches(u'tadeusz żeleński (boy)'), (self.unicode_tag,))
+
+    def test_word_boundary(self):
+        self.assertEqual(views.find_best_matches(u'SubWord'), (self.author_tag,))
+        self.assertEqual(views.find_best_matches(u'[SubWord'), (self.author_tag,))
+
+    def test_unrelated_search(self):
+        self.assertEqual(views.find_best_matches(u'alamakota'), tuple())
+        self.assertEqual(views.find_best_matches(u'Adama'), ())
+
+    def test_infix_doesnt_match(self):
+        """ Searching for middle of a word shouldn't match. """
+        self.assertEqual(views.find_best_matches(u'deusz'), tuple())
+
+    def test_diactricts_removal_pl(self):
+        """ Tags should match both with and without national characters. """
+        self.assertEqual(views.find_best_matches(u'ĘÓĄŚŁŻŹĆŃęóąśłżźćń'), (self.polish_tag,))
+        self.assertEqual(views.find_best_matches(u'EOASLZZCNeoaslzzcn'), (self.polish_tag,))
+        self.assertEqual(views.find_best_matches(u'eoaslzzcneoaslzzcn'), (self.polish_tag,))
+
+    def test_diactricts_query_removal_pl(self):
+        """ Tags without national characters shouldn't be matched by queries with them. """
+        self.assertEqual(views.find_best_matches(u'Adąm'), ())
+
+    def test_sloppy(self):
+        self.assertEqual(views.find_best_matches(u'Żelenski'), (self.unicode_tag,))
+        self.assertEqual(views.find_best_matches(u'zelenski'), (self.unicode_tag,))
+
+
+class PersonStub(object):
+
+    def __init__(self, first_names, last_name):
+        self.first_names = first_names
+        self.last_name = last_name
+
+from slughifi import slughifi
+
+class BookInfoStub(object):
+
+    def __init__(self, **kwargs):            
+        self.__dict = kwargs
+
+    def __setattr__(self, key, value):
+        if not key.startswith('_'):
+            self.__dict[key] = value
+        return object.__setattr__(self, key, value)
+
+    def __getattr__(self, key):
+        return self.__dict[key]
+
+    def to_dict(self):
+        return dict((key, unicode(value)) for key, value in self.__dict.items())
+
+def info_args(title):
+    """ generate some keywords for comfortable BookInfoCreation  """
+    slug = unicode(slughifi(title))
+    return {'title': unicode(title),
+            'slug': slug,
+            'url': u"http://wolnelektury.pl/example/%s" % slug,
+            'about': u"http://wolnelektury.pl/example/URI/%s" % slug,
+            }
+
+class BookImportLogicTests(TestCase):
+
+    def setUp(self):
+        self.book_info = BookInfoStub(
+            url=u"http://wolnelektury.pl/example/default_book",
+            about=u"http://wolnelektury.pl/example/URI/default_book",
+            title=u"Default Book",
+            author=PersonStub(("Jim",), "Lazy"),
+            kind="X-Kind",
+            genre="X-Genre",
+            epoch="X-Epoch",
+        )
+
+        self.expected_tags = [
+           ('author', 'jim-lazy'),
+           ('genre', 'x-genre'),
+           ('epoch', 'x-epoch'),
+           ('kind', 'x-kind'),
+        ]
+        self.expected_tags.sort()
+
+    def tearDown(self):
+        models.Book.objects.all().delete()
+
+    def test_empty_book(self):
+        BOOK_TEXT = "<utwor />"
+        book = models.Book.from_text_and_meta(ContentFile(BOOK_TEXT), self.book_info)
+
+        self.assertEqual(book.title, "Default Book")
+        self.assertEqual(book.slug, "default_book")
+        self.assert_(book.parent is None)
+        self.assertFalse(book.has_html_file())
+
+        # no fragments generated
+        self.assertEqual(book.fragments.count(), 0)
+
+        # TODO: this should be filled out probably...
+        self.assertEqual(book.wiki_link, '')
+        self.assertEqual(book.gazeta_link, '')
+        self.assertEqual(book._short_html, '')
+        self.assertEqual(book.description, '')
+
+        tags = [ (tag.category, tag.slug) for tag in book.tags ]
+        tags.sort()
+
+        self.assertEqual(tags, self.expected_tags)
+    
+    def test_not_quite_empty_book(self):
+        """ Not empty, but without any real text.
+        
+        Should work like any other non-empty book.
+        """
+        
+        BOOK_TEXT = """<utwor>
+        <liryka_l>
+            <nazwa_utworu>Nic</nazwa_utworu>
+        </liryka_l></utwor>
+        """
+        
+        book = models.Book.from_text_and_meta(ContentFile(BOOK_TEXT), self.book_info)
+        self.assertTrue(book.has_html_file())
+
+    def test_book_with_fragment(self):
+        BOOK_TEXT = """<utwor>
+        <opowiadanie>
+            <akap><begin id="m01" /><motyw id="m01">Love</motyw>Ala ma kota<end id="m01" /></akap>
+        </opowiadanie></utwor>
+        """
+
+        book = models.Book.from_text_and_meta(ContentFile(BOOK_TEXT), self.book_info)
+        self.assertTrue(book.has_html_file())
+
+        self.assertEqual(book.fragments.count(), 1)
+        self.assertEqual(book.fragments.all()[0].text, u'<p class="paragraph">Ala ma kota</p>\n')
+
+        self.assert_(('theme', 'love') in [ (tag.category, tag.slug) for tag in book.tags ])
+
+    def test_book_replace_title(self):
+        BOOK_TEXT = """<utwor />"""
+        self.book_info.title = u"Extraordinary"
+        book = models.Book.from_text_and_meta(ContentFile(BOOK_TEXT), self.book_info)
+
+        tags = [ (tag.category, tag.slug) for tag in book.tags ]
+        tags.sort()
+
+        self.assertEqual(tags, self.expected_tags)
+
+    def test_book_replace_author(self):
+        BOOK_TEXT = """<utwor />"""
+        self.book_info.author = PersonStub(("Hans", "Christian"), "Andersen")
+        book = models.Book.from_text_and_meta(ContentFile(BOOK_TEXT), self.book_info)
+
+        tags = [ (tag.category, tag.slug) for tag in book.tags ]
+        tags.sort()
+
+        self.expected_tags.remove(('author', 'jim-lazy'))
+        self.expected_tags.append(('author', 'hans-christian-andersen'))
+        self.expected_tags.sort()
+
+        self.assertEqual(tags, self.expected_tags)
+
+        # the old tag should disappear 
+        self.assertRaises(models.Tag.DoesNotExist, models.Tag.objects.get,
+                    slug="jim-lazy", category="author")
+
+
+    
+class BooksByTagTests(TestCase):
+    """ tests the /katalog/tag page for found books """
+