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

[Laura Rupprecht]

Laura Rupprecht added the comment:

Thanks Berker!

I've added some updates to the patch taking your suggestions into account. There is also a change from using "detect_module_matches" to "detect_api_mismatch", as it is a more general (and accurate) description.

Also, adding tests for the "detect_api_mismatch" helper function.

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Added file: http://bugs.python.org/file39007/issue9859_1.patch

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