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The test test_shutil.TestWhich.test_non_matching_mode fails when running as root because the temporary file is always writeable for this user.
To reproduce on linux:
$ sudo python3.3 -E -Wd -tt /usr/lib/python3.3/test/regrtest.py -v -w test_shutil
[...]
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FAIL: test_non_matching_mode (test.test_shutil.TestWhich)
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Traceback (most recent call last):
 File "/usr/lib/python3.3/test/test_shutil.py", line 1334, in test_non_matching_mode
 self.assertIsNone(rv)
AssertionError: '/tmp/Tmpnf1xg5/Tmptzup_q.Exe' is not None
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Possible solutions:
- skip the test when running as root
- search for a file with executable bit set instead of writeable
- set immutable attribute on the file