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

[Brandon Craig Rhodes]

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

Benjamin, thanks for the pointers! The attached patch now uses assertIs() and assertIsNot(), and calls self.fail() instead of using the exception from "support".

In the future I would like some way to determine when test coverage is fully achieved, so that I do not come back to this module every few months and have to re-discover why it is not 100%. But for the moment I have indeed removed the pragmas, pending a better approach!

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Added file: http://bugs.python.org/file21246/test_copy2.patch

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