[issue8273] move test_support into the unittest package

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

I agree that some things can be moved in unittest, however several of the function in test_support are designed specifically for being used for the python test suite. For example temp_cwd is something that could be really useful in unittest in my opinion, however we designed it looking at our use cases. We limited its utility to what we needed and we didn't document it so that we are free to change it if/when the use cases change.

On a side node, sortdict() is probably useless now that we have assertDictEqual().

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nosy: +ezio.melotti

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