[issue17665] convert test_wsgiref to idiomatic unittest code

[Serhiy Storchaka]

New submission from Serhiy Storchaka:

I don't think the second change is correct.

See also issue16510.

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nosy: +serhiy.storchaka
type: performance -> enhancement

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17665>
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