[issue9859] Add tests to verify API match of modules with 2 implementations

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

+1
I presume you can use the experience with #9858 to either refine the program to have fewer false positives or refine the program doc to explain the possibility where such are unavoidable. (And as a lint-like metatest, I think false positives are better than false negatives.)

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nosy: +terry.reedy

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<http://bugs.python.org/issue9859>
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