bpo-2661: Make mapping tests better usable for custom mapping classes. by doerwalter · Pull Request #11157 · python/cpython
In test_fromkeys() the derived test class now supports all arguments in its constructor so that the class to be tested can use its own constructor in its fromkeys() implementation. In test_mutatingiteration() the test fails as soon as iterating over a dictionary with one entry and adding new entries in the loop iterates more than once (to avoid endless loops in faulty implementations).
DinoV pushed a commit to DinoV/cpython that referenced this pull request
Jan 14, 2020
pythonGH-11157) In test_fromkeys() the derived test class now supports all arguments in its constructor so that the class to be tested can use its own constructor in its fromkeys() implementation. In test_mutatingiteration() the test fails as soon as iterating over a dictionary with one entry and adding new entries in the loop iterates more than once (to avoid endless loops in faulty implementations). https://bugs.python.org/issue2661
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