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[3.13] gh-138669: Increase test coverage for difflib (GH-138670) (#138818)

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gh-138669: Increase test coverage for difflib (GH-138670)
(cherry picked from commit 44991619ba)

Co-authored-by: Jan-Eric Nitschke <47750513+JanEricNitschke@users.noreply.github.com>
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Miss Islington (bot) 2025-09-14 21:42:05 +02:00 • committed by GitHub
parent 0b302280af
commit d8d11d50bf
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1 changed files with 39 additions and 0 deletions
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39
Lib/test/test_difflib.py
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@ -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('&#305;mpl&#305;c&#305;t', 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