[issue15836] unittest assertRaises should verify excClass is actually a BaseException class

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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nosy: +berker.peksag
stage: patch review -> commit review
versions: +Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15836>
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