[issue25479] Increase unit test coverage for abc.py

[Irit Katriel]

Irit Katriel <iritkatriel at yahoo.com> added the comment:

Thank you!

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25479>
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