[issue17037] Use a test.support helper to wrap the PEP 399 boilerplate

[Eric Snow]

Eric Snow added the comment:

Any objections to what Brett proposed?  Any preferences on a name?  How about DualImplementationTests?  Here's a patch with tests.

I added a pure_python_only() decorator in addition to accelerated_only().  I also made both work as decorators for classes and methods (just like unittest.skip()).

Finally, I added on a with_module_exported() decorator to help with the scenario from issue #16817.  Eli, I know it doesn't quite fill the gap you described in msg180669, but hopefully it's an improvement.

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Added file: http://bugs.python.org/file28973/dual-impl-tests.diff

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