[issue25690] Replacement for unittest.mock.mock_open

[Niv Ben-David]

Niv Ben-David added the comment:

Regarding the documentation changes, my version simply mocks `open` more "closely", so for the most part I can't think of any changes to the documentation. I've added a bit about the mock object acting as a map of file names to mock objects. Should I add anything else?

Regarding the tests, I've tried changing as little as possible to make sure I don't have any backward compatibility issues. However, some changes had to be made:
* By default, `open`'s mode is 'r', the new mock_open imitates this behavior, and so the test shows. Also, calling `open` as a context manager will call `close` in `__exit__`. These are the majority of changes to the testing code.
* test_mock_open_write and test_mock_open_read_with_argument: These functionalities' testing is taken care of by the new mock_open tests.
* test_readlines_data: I removed the `create` argument to `patch`. Must've been by accident. Fixed this in the new patch.

Sorry about the (very) late response, I've been preoccupied lately.

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Added file: http://bugs.python.org/file41762/mock_open.patch

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