[issue25690] Replacement for unittest.mock.mock_open

[R. David Murray]

R. David Murray added the comment:

Thanks for the submission. I haven't looked at this in detail, but the fact that you are changing existing unit tests indicates there is probably a backward compatibility problem with your patch.  Also if you are adding features I'd expect there to be doc changes, which would make it easier to understand what you are proposing.

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nosy: +r.david.murray

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