Method test_ratio_for_null_seqn

Lib/test/test_difflib.py:75–80

(self)

class TestSFbugs(unittest.TestCase):
    def test_ratio_for_null_seqn(self):
        # Check clearing of SF bug 763023
        s = difflib.SequenceMatcher(None, [], [])
        self.assertEqual(s.ratio(), 1)
        self.assertEqual(s.quick_ratio(), 1)
        self.assertEqual(s.real_quick_ratio(), 1)

    def test_comparing_empty_lists(self):
        # Check fix for bug #979794