[issue26040] Improve coverage and rigour of test.test_math

[Roundup Robot]

Roundup Robot added the comment:

New changeset 1017215f5492 by Mark Dickinson in branch 'default':
Issue #26040 (part 1): add new testcases to cmath_testcases.txt. Thanks Jeff Allen.
https://hg.python.org/cpython/rev/1017215f5492

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nosy: +python-dev

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