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Issue #18996: TestCase.assertEqual() now more cleverly shorten differing

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strings in error report.
This commit is contained in:
Serhiy Storchaka 2013-09-23 23:07:00 +03:00
parent 463bd4b5c6
commit 77622f55c2
4 changed files with 81 additions and 16 deletions
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37
Lib/unittest/test/test_case.py
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@ -829,18 +829,18 @@ class Test_TestCase(unittest.TestCase, TestEquality, TestHashing):
# set a lower threshold value and add a cleanup to restore it
old_threshold = self._diffThreshold
self._diffThreshold = 2**8
self._diffThreshold = 2**5
self.addCleanup(lambda: setattr(self, '_diffThreshold', old_threshold))
# under the threshold: diff marker (^) in error message
s = 'x' * (2**7)
s = 'x' * (2**4)
with self.assertRaises(self.failureException) as cm:
self.assertEqual(s + 'a', s + 'b')
self.assertIn('^', str(cm.exception))
self.assertEqual(s + 'a', s + 'a')
# over the threshold: diff not used and marker (^) not in error message
s = 'x' * (2**9)
s = 'x' * (2**6)
# if the path that uses difflib is taken, _truncateMessage will be
# called -- replace it with explodingTruncation to verify that this
# doesn't happen
@ -857,6 +857,37 @@ class Test_TestCase(unittest.TestCase, TestEquality, TestHashing):
self.assertEqual(str(cm.exception), '%r != %r' % (s1, s2))
self.assertEqual(s + 'a', s + 'a')
def testAssertEqual_shorten(self):
# set a lower threshold value and add a cleanup to restore it
old_threshold = self._diffThreshold
self._diffThreshold = 0
self.addCleanup(lambda: setattr(self, '_diffThreshold', old_threshold))
s = 'x' * 100
s1, s2 = s + 'a', s + 'b'
with self.assertRaises(self.failureException) as cm:
self.assertEqual(s1, s2)
c = 'xxxx[35 chars]' + 'x' * 61
self.assertEqual(str(cm.exception), "'%sa' != '%sb'" % (c, c))
self.assertEqual(s + 'a', s + 'a')
p = 'y' * 50
s1, s2 = s + 'a' + p, s + 'b' + p
with self.assertRaises(self.failureException) as cm:
self.assertEqual(s1, s2)
c = 'xxxx[85 chars]xxxxxxxxxxx'
#print()
#print(str(cm.exception))
self.assertEqual(str(cm.exception), "'%sa%s' != '%sb%s'" % (c, p, c, p))
p = 'y' * 100
s1, s2 = s + 'a' + p, s + 'b' + p
with self.assertRaises(self.failureException) as cm:
self.assertEqual(s1, s2)
c = 'xxxx[91 chars]xxxxx'
d = 'y' * 40 + '[56 chars]yyyy'
self.assertEqual(str(cm.exception), "'%sa%s' != '%sb%s'" % (c, d, c, d))
def testAssertCountEqual(self):
a = object()
self.assertCountEqual([1, 2, 3], [3, 2, 1])