[issue21750] mock_open data is visible only once for the life of the class

[Paul Koning]

Paul Koning added the comment:

Section 26.7.7 of the library manual describes mock_open with the words:

A helper function to create a mock to replace the use of open. It works for open called directly or used as a context manager.

which implies that it works just like open.  Given that it doesn't (not if you do two opens and use both streams concurrently) that difference should be called out as a difference, or limitation.

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