[issue26040] Improve coverage and rigour of test.test_math

[Mark Dickinson]

Mark Dickinson added the comment:

I finally have some time to look at this. I've double-checked all the new cmath testcases against MPFR (via bigfloat), and they all look good. I plan to apply this in two stages: (1) apply the new cmath testcases, (2) apply the test_math changes, and (1.5) watch for buildbot failures in-between.

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