[issue9554] test_argparse.py: use new unittest features

[Roundup Robot]

Roundup Robot added the comment:

New changeset f240ca6345c8 by Berker Peksag in branch 'default':
Issue #9554: Use modern unittest features in test_argparse.
http://hg.python.org/cpython/rev/f240ca6345c8

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nosy: +python-dev

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