[issue16748] Ensure test discovery doesn't break for modules testing C and Python implementations

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

No need to add this trivial class to test.support. Mixin can have different parameters in additional to 'module' (see 16659).

I found a lot of usages of this idiom in tests and some of them can't be changed so simple (for example test_genericpath and test_functools).

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nosy: +serhiy.storchaka

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