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Diffstat (limited to 'Lib/test/test_zlib.py')
| -rw-r--r-- | Lib/test/test_zlib.py | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py index 9f0fe18..0c96842 100644 --- a/Lib/test/test_zlib.py +++ b/Lib/test/test_zlib.py @@ -53,6 +53,15 @@ class ChecksumTestCase(unittest.TestCase): self.assertEqual(binascii.crc32(foo), zlib.crc32(foo)) self.assertEqual(binascii.crc32('spam'), zlib.crc32('spam')) + def test_negative_crc_iv_input(self): + # The range of valid input values for the crc state should be + # -2**31 through 2**32-1 to allow inputs artifically constrained + # to a signed 32-bit integer. + self.assertEqual(zlib.crc32('ham', -1), zlib.crc32('ham', 0xffffffffL)) + self.assertEqual(zlib.crc32('spam', -3141593), + zlib.crc32('spam', 0xffd01027L)) + self.assertEqual(zlib.crc32('spam', -(2**31)), + zlib.crc32('spam', (2**31))) class ExceptionTestCase(unittest.TestCase): |