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Improve preformance of TestCase.subTest() in python 3.10 #13970

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Improve preformance of TestCase.subTest() in python 3.10 #13970

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@AkaZecik AkaZecik commented Nov 16, 2025

Fixes #13965

nicoddemus added a commit to nicoddemus/pytest that referenced this pull request Nov 21, 2025
@nicoddemus
Fix quadratic-time behavior when handling unittest subtests in Pyth…
7e2edcf 
…on 3.10

Fix pytest-dev#13965
Close pytest-dev#13970
@nicoddemus nicoddemus mentioned this pull request Nov 21, 2025
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nicoddemus commented Nov 21, 2025

Thanks a lot for the report and PR @AkaZecik, appreciate it.

Found a simpler solution in #13993, we can cache the errors and skips in TestCaseFunction itself.

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Quadratic blowup when using TestCase subtests in python 3.10

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@AkaZecik @nicoddemus