[issue25479] Increase unit test coverage for abc.py

[Irit Katriel]

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


New changeset 1be93960612b29686d42c021f842e63e5143a625 by Miss Islington (bot) in branch '3.9':
bpo-25479: add unit test for __subclasshook__ in test_abc.py (GH-24034) (GH-26063)
https://github.com/python/cpython/commit/1be93960612b29686d42c021f842e63e5143a625


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