[issue25695] test___all__ and test_support alter execution environment

[SilentGhost]

SilentGhost added the comment:

test_support has this line:

TESTDIRN = os.path.basename(tempfile.mkdtemp(dir='.'))

Which is the culprit. The reason it gets so far as to import the module is due to the "fuzzy logic" check looking for __all__ 
What I'd suggest is replacing simple "in" string search with re.search for '\b__all__\b'. The downside of this is that the test execution time increased from .4 s to .7 s on my machine.

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keywords: +needs review, patch
nosy: +SilentGhost
stage:  -> patch review
Added file: http://bugs.python.org/file41122/issue25695.diff

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