[issue2661] Mapping tests cannot be passed by user implementations

[Éric Araujo]

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

> I think it would be great to test the stdlib’s mapping classes against common tests
grep told me that most of them already do.  Sorry for the noise, it’s late/soon here.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2661>
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