py36+ tests are definition ordered [v2] #9144
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Co-authored-by: Anthony Sottile <[email protected]>
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Fixes #5196. Closes #7848.
This PR updates @asottile's PR #7848 to also ensure that tests from base classes are ordered before tests defined in the subclasses.
Besides pytest's tests, I also tested it on two projects (using Python 3.9.7):
pytest: the collection tree is the same. Collection time goes from 5.81s to 3.51s.
pandas: the collection tree is almost the same, except 2 test classes where tests from base classes are now ordered before the subclasses (for reference, these are
TestDataFrame(Generic),TestCategoricalIndex(Base)). I think this behavior change is good. Collection time goes from 65.89s to 45.80s.The main speedup comes from avoiding
inspect.getsource()calls on test class objects, used previously to manually sort by definition order. The function is slow, and I suspect (didn't verify) that it got much slower in Python 3.9 due to some correctness fixes (details here).