[docs] [issue11015] Bring test.support docs up to date

[Ezio Melotti]

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

I left a few comments on rietveld for the testdoc and remove_fcmp patches.
Unless I'm missing something, assertEqual works just fine in all the places where fcmp was used, so there's no need to use assertAlmostEqual.

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nosy: +ezio.melotti

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