[issue18365] Idle: mock Text class and test thereof

[Terry J. Reedy]

Terry J. Reedy added the comment:

The real problem with 'end' and 'big.m' is that there are three proper decodings, depending on the method asking. I think this patch mostly solves the problems mentioned before. All tests, including many new ones, pass.

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Added file: http://bugs.python.org/file30898/mock_text5.diff

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