[issue12703] Improve error reporting for packaging.util.resolve_name

[Éric Araujo]

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

Thanks.  I’ll add more tests and commit.  (I also prefer to create modules in test methods instead of using another file, so that I can see right here what the module contains.)

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<http://bugs.python.org/issue12703>
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