[issue4265] shutil.copyfile() leaks file descriptors when disk fills

[Tres Seaver]

Tres Seaver <tseaver at agendaless.com> added the comment:

I would be glad to write those tests, if you could explain the strategy you have in mind more fully:  since 'shutil.copyfile' performs the 'open' itself, I couldn't figure out how to stub in such a mocked up file.

Does 'open' provide a hook for testing purposes that I don't know about?

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