Method test_one_insert_homogenous_sequence

Lib/test/test_difflib.py:58–71

(self)

class TestAutojunk(unittest.TestCase):
    """Tests for the autojunk parameter added in 2.7"""
    def test_one_insert_homogenous_sequence(self):
        # By default autojunk=True and the heuristic kicks in for a sequence
        # of length 200+
        seq1 = 'b' * 200
        seq2 = 'a' + 'b' * 200

        sm = difflib.SequenceMatcher(None, seq1, seq2)
        self.assertAlmostEqual(sm.ratio(), 0, places=3)
        self.assertEqual(sm.bpopular, {'b'})

        # Now turn the heuristic off
        sm = difflib.SequenceMatcher(None, seq1, seq2, autojunk=False)
        self.assertAlmostEqual(sm.ratio(), 0.9975, places=3)
        self.assertEqual(sm.bpopular, set())


class TestSFbugs(unittest.TestCase):