[issue21741] Convert most of the test suite to using unittest.main()

[Roundup Robot]

Roundup Robot added the comment:

New changeset 706fab0213db by Zachary Ware in branch 'default':
Issue #21741: Add st_file_attributes to os.stat_result on Windows.
http://hg.python.org/cpython/rev/706fab0213db

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

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21741>
_______________________________________