[issue17163] Fix test discovery for test_file.py

[Roundup Robot]

New submission from Roundup Robot:

New changeset 9b3c5085b4a4 by Ezio Melotti in branch '3.3':
#17163: test_file now works with unittest test discovery.  Patch by Zachary Ware.
http://hg.python.org/cpython/rev/9b3c5085b4a4

New changeset f289e40b3d70 by Ezio Melotti in branch 'default':
#17163: merge with 3.3.
http://hg.python.org/cpython/rev/f289e40b3d70

----------
nosy: +python-dev

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17163>
_______________________________________