[issue20574] Implement incremental decoder for cp65001

[STINNER Victor]

STINNER Victor added the comment:

> Could you please also add test_partial for CP65001 (if this will make sense)?

I added CP65001Test which inherit from UTF8Test and so runs all UTF-8 tests on cp65001 codec. I'm surprised that the test pass.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20574>
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