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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 84d7ec21cc43 by Serhiy Storchaka in branch 'default':
Issue #15836: assertRaises(), assertRaisesRegex(), assertWarns() and
https://hg.python.org/cpython/rev/84d7ec21cc43

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nosy: +python-dev

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