[issue20373] Use test.script_helper.assert_python_ok() instead of subprocess.* in test.test_warnings

[Roundup Robot]

Roundup Robot added the comment:

New changeset d844b31471b5 by Antoine Pitrou in branch '3.3':
Issue #20373: generalize use of test.script_helper in test_warnings.  Patch by Arfrever.
http://hg.python.org/cpython/rev/d844b31471b5

New changeset 04b658b3fe7c by Antoine Pitrou in branch 'default':
Issue #20373: generalize use of test.script_helper in test_warnings.  Patch by Arfrever.
http://hg.python.org/cpython/rev/04b658b3fe7c

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nosy: +python-dev

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<http://bugs.python.org/issue20373>
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