[issue17789] Fix test discovery for test_random.py

[Roundup Robot]

Roundup Robot added the comment:

New changeset 678564fc0962 by Ezio Melotti in branch '3.3':
#17789: test_random now works with unittest test discovery.  Patch by Zachary Ware.
http://hg.python.org/cpython/rev/678564fc0962

New changeset ac352d7d8058 by Ezio Melotti in branch 'default':
#17789: merge with 3.3.
http://hg.python.org/cpython/rev/ac352d7d8058

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nosy: +python-dev

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<http://bugs.python.org/issue17789>
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