https://github.com/python/cpython/commit/d8d11d50bf54df3005c4833282a1988fe9b4a0e5 commit: d8d11d50bf54df3005c4833282a1988fe9b4a0e5 branch: 3.13 author: Miss Islington (bot) <[email protected]> committer: gpshead <[email protected]> date: 2025-09-14T19:42:05Z summary:
[3.13] gh-138669: Increase test coverage for difflib (GH-138670) (#138818) gh-138669: Increase test coverage for difflib (GH-138670) (cherry picked from commit 44991619ba04a98c5878ee5bbc38d2e47cbd22c7) Co-authored-by: Jan-Eric Nitschke <[email protected]> files: M Lib/test/test_difflib.py diff --git a/Lib/test/test_difflib.py b/Lib/test/test_difflib.py index 6afd90af8442ad..943d7a659b1e1b 100644 --- a/Lib/test/test_difflib.py +++ b/Lib/test/test_difflib.py @@ -29,6 +29,16 @@ def test_one_delete(self): ('delete', 40, 41, 40, 40), ('equal', 41, 81, 40, 80)]) + def test_opcode_caching(self): + sm = difflib.SequenceMatcher(None, 'b' * 100, 'a' + 'b' * 100) + opcode = sm.get_opcodes() + self.assertEqual(opcode, + [ ('insert', 0, 0, 0, 1), + ('equal', 0, 100, 1, 101)]) + # Implementation detail: opcodes are cached; + # `get_opcodes()` returns the same object + self.assertIs(opcode, sm.get_opcodes()) + def test_bjunk(self): sm = difflib.SequenceMatcher(isjunk=lambda x: x == ' ', a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40) @@ -273,6 +283,15 @@ def test_make_file_usascii_charset_with_nonascii_input(self): self.assertIn('ımplıcıt', output) + def test_one_insert(self): + m = difflib.Differ().compare('b' * 2, 'a' + 'b' * 2) + self.assertEqual(list(m), ['+ a', ' b', ' b']) + + def test_one_delete(self): + m = difflib.Differ().compare('a' + 'b' * 2, 'b' * 2) + self.assertEqual(list(m), ['- a', ' b', ' b']) + + class TestOutputFormat(unittest.TestCase): def test_tab_delimiter(self): args = ['one', 'two', 'Original', 'Current', @@ -547,6 +566,26 @@ def test_longest_match_with_popular_chars(self): self.assertFalse(self.longer_match_exists(a, b, match.size)) +class TestCloseMatches(unittest.TestCase): + # Happy paths are tested in the doctests of `difflib.get_close_matches`. + + def test_invalid_inputs(self): + self.assertRaises(ValueError, difflib.get_close_matches, "spam", ['egg'], n=0) + self.assertRaises(ValueError, difflib.get_close_matches, "spam", ['egg'], n=-1) + self.assertRaises(ValueError, difflib.get_close_matches, "spam", ['egg'], cutoff=1.1) + self.assertRaises(ValueError, difflib.get_close_matches, "spam", ['egg'], cutoff=-0.1) + + +class TestRestore(unittest.TestCase): + # Happy paths are tested in the doctests of `difflib.restore`. + + def test_invalid_input(self): + with self.assertRaises(ValueError): + ''.join(difflib.restore([], 0)) + with self.assertRaises(ValueError): + ''.join(difflib.restore([], 3)) + + def setUpModule(): difflib.HtmlDiff._default_prefix = 0 _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3//lists/python-checkins.python.org Member address: [email protected]
