def test_add_to_index(self):
indexer = Indexer()
index = {}
keyword = "keyword"
url = "http://dn.se"
indexer.add_to_index(index, keyword, 42, url)
self.assertEqual({'keyword': [[42, 'http://dn.se']]}, index)
indexer.add_to_index(index, keyword, 43, url)
self.assertEqual({'keyword': [[42, 'http://dn.se'], [43, 'http://dn.se']]}, index)
