[issue17492] Increase test coverage for random (up to 99%)

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2a340f963518 by R David Murray in branch 'default':
#17492: Additional tests for random module.
http://hg.python.org/cpython/rev/2a340f963518

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nosy: +python-dev

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<http://bugs.python.org/issue17492>
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