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#11763: don't use difflib in TestCase.assertMultiLineEqual if the strings are too long.

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Ezio Melotti 2011-04-27 10:17:34 +03:00
parent 72387f90fd
commit 935a588825
3 changed files with 45 additions and 0 deletions
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7
Lib/unittest.py
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@ -346,6 +346,9 @@ class TestCase(object):
longMessage = False
# If a string is longer than _diffThreshold, use normal comparison instead
# of difflib. See #11763.
_diffThreshold = 2**16
def __init__(self, methodName='runTest'):
"""Create an instance of the class that will use the named test
@ -955,6 +958,10 @@ class TestCase(object):
'Second argument is not a string'))
if first != second:
# don't use difflib if the strings are too long
if (len(first) > self._diffThreshold or
len(second) > self._diffThreshold):
self._baseAssertEqual(first, second, msg)
standardMsg = '\n' + ''.join(difflib.ndiff(first.splitlines(True), second.splitlines(True)))
self.fail(self._formatMessage(msg, standardMsg))