[PR #14018/004a9674 backport][9.0.x] Catch conftest blocking#14074
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nicoddemus merged 1 commit into9.0.xfrom Dec 29, 2025
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This is a backport of PR #14018 as merged into main (004a967).
closes #13634
Summary
This PR fixes an issue where attempting to disable a
conftest.pyfile using the-p no:option resulted in an internal assertion failure.conftest.pyfiles are not plugins and cannot be enabled or disabled using-p, but pytest previously accepted such arguments and crashed later during plugin loading with:Pytest now rejects attempts to block a conftest early during argument processing and raises a clear
UsageErrorexplaining that conftest files cannot be disabled via-p.What’s Changed
Added explicit detection for
-p no:<name>where<name>refers to a conftest file (e.g. conftest.py, or a path to a conftest).Introduced an early
UsageErrorwith an actionable message.Updated config test