[issue21503] Use test_both() consistently throughout test_importlib

[Roundup Robot]

Roundup Robot added the comment:

New changeset 34d65746d5ca by Eric Snow in branch 'default':
Issue #21503: Use test_both() consistently in test_importlib.
http://hg.python.org/cpython/rev/34d65746d5ca

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21503>
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