[issue17665] convert test_wsgiref to idiomatic unittest code

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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nosy: +terry.reedy
stage:  -> patch review
title: convert to idiomatic unittest code -> convert test_wsgiref to idiomatic unittest code
type:  -> performance
versions:  -Python 3.2

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