[issue11049] add tests for test.support

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 1a978892a105 by Eli Bendersky in branch 'default':
Issue #11049: fix test_forget to work on installed Python, by using a temporary module for import/forget
http://hg.python.org/cpython/rev/1a978892a105

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<http://bugs.python.org/issue11049>
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