[issue26040] Improve coverage and rigour of test.test_math

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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nosy: +christian.heimes, eric.smith, lemburg, serhiy.storchaka, stutzbach
versions: +Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26040>
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