def test_search_reverse(self): Equal = self.assertEqual line = "Here is an 'is' test text." prog = re.compile('is') Equal(se.search_reverse(prog, line, len(line)).span(), (12, 14)) Equal(se.search_reverse(prog, line, 14).span(), (12, 14)) Equal(se.search_reverse(prog, line, 13).span(), (5, 7)) Equal(se.search_reverse(prog, line, 7).span(), (5, 7)) Equal(se.search_reverse(prog, line, 6), None)