[issue11049] add tests for test.support

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

I should note that I am not suggesting that test.support suddenly be considered a module with a stable API that the public can use. Simply that we take the proper measures to make sure the code in there does what is expected.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11049>
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