[issue11910] test_heapq C tests are not skipped when _heapq is missing

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

Attached a patch that fixes import_fresh_module to return None when _heapq is missing and skips the C test when _heapq is missing.

I also added an additional test to verify that the functions in c_heapq are really C functions and the ones in py_heapq are really Python functions.

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Added file: http://bugs.python.org/file21936/issue11910.diff

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