[issue11557] Increase coverage in logging module

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset d93e18e6a3e8 by Vinay Sajip in branch 'default':
Attempt fix of #11557 by refining test logic.
http://hg.python.org/cpython/rev/d93e18e6a3e8

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11557>
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