[issue16444] Use support.TESTFN_UNDECODABLE on UNIX

[STINNER Victor]

STINNER Victor added the comment:

> These encodings used not only on Windows.

You can uses cpXXX encodings explictly to read or write a file, but these encodings are not used for sys.getfilesystemencoding() (or sys.stdout.encoding).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16444>
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