config: Do not fail if a warning filter category cannot be imported #13732
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isra17 force-pushed the isra/upstream-no-warning-fail branch from 2521fe3 to 1258ad6 Compare 
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nicoddemus requested changes Sep 18, 2025
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Thanks @isra17 for the contribution!
Other than the comments I left, please look at the test failure: that test is verifying that we error out if the warnings filter could not be imported, which is exactly what you have changed here. I think you only need to remove that case from the paramatrization.
isra17 force-pushed the isra/upstream-no-warning-fail branch 5 times, most recently from 7dd2cbb to 195f5e2 Compare 
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| The branch is now green and I addressed all your comments. Thanks for your quick review! |
nicoddemus reviewed Sep 18, 2025
changelog/13732.improvement.rst Outdated
| @@ -0,0 +1 @@ | |||
| Do not fail when a warning category cannot be imported. Log a warning instead. | |||
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Suggested change
| Do not fail when a warning category cannot be imported. Log a warning instead. | |
| Previously, when filtering warnings, pytest would fail if the filter referenced a class that could not be imported. Now, this only outputs a message indicating the problem. |
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Could you also apply that change? Thanks!
isra17 force-pushed the isra/upstream-no-warning-fail branch from 17f7b25 to 950e781 Compare 
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We stumbled into an issue using tools like pants that will generate test environment with minimal dependencies. If used with warning filters with categories from third-party library, pytest is going to fail for any test without this third-party. This is unecessary and any workaround in
conftest.pyis impossible due to #13485So this PR change the behavior of failed category import to just log a warning and skip the warning entry.