[issue17334] Fix test discovery for test_index.py

[Roundup Robot]

Roundup Robot added the comment:

New changeset 886df716cd09 by Ezio Melotti in branch '3.3':
#17334: test_index now works with unittest test discovery.  Patch by Zachary Ware.
http://hg.python.org/cpython/rev/886df716cd09

New changeset 1c71882938eb by Ezio Melotti in branch 'default':
#17334: merge with 3.3.
http://hg.python.org/cpython/rev/1c71882938eb

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nosy: +python-dev

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<http://bugs.python.org/issue17334>
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