[issue11572] bring Lib/copy.py to 100% coverage

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

The suggestion about assertIsInstance was a mistake, I misread issubclass in the original code.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11572>
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