[issue17665] convert test_wsgiref to idiomatic unittest code

[Ezio Melotti]

Ezio Melotti added the comment:

In this case I don't think it matters much.  The value is either True or False, so both assertTrue(...) and assertIs(..., True) work, even though the latter is technically more accurate.

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nosy: +ezio.melotti

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<http://bugs.python.org/issue17665>
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