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

[Brandon Craig Rhodes]

Brandon Craig Rhodes <brandon at rhodesmill.org> added the comment:

Éric, I think your points are good ones. (And, as I return to this patch after three months, I should thank the PSF for sponsoring the CPython sprint here at PyOhio, and creating this opportunity for me to continue trying to land this patch!) I am attaching a fourth version of the patch. It incorporates your two suggestions, Éric. It also applies cleanly once against today's trunk; besides the usual line number changes as code has come and gone, I am happy to see that my change of an "assertTrue" for an "assertIs" in the test suite has already taken place thanks to another patch in the meantime.

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Added file: http://bugs.python.org/file22822/test_copy4.patch

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