[issue17790] Fix test discovery for test_set.py

[Roundup Robot]

Roundup Robot added the comment:

New changeset ef100be2e8ba by Ezio Melotti in branch '3.3':
#17790: test_set now works with unittest test discovery.  Patch by Zachary Ware.
http://hg.python.org/cpython/rev/ef100be2e8ba

New changeset 8a0b3ece5c28 by Ezio Melotti in branch 'default':
#17790: merge with 3.3.
http://hg.python.org/cpython/rev/8a0b3ece5c28

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nosy: +python-dev

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<http://bugs.python.org/issue17790>
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