Fix monkeypatch undo when deleting missing attrs/items with raising=False#14271
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kartikdp wants to merge 1 commit intopytest-dev:mainfrom
Open
Fix monkeypatch undo when deleting missing attrs/items with raising=False#14271kartikdp wants to merge 1 commit intopytest-dev:mainfrom
kartikdp wants to merge 1 commit intopytest-dev:mainfrom
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Summary
Fixes a state-restoration bug in
MonkeyPatchwhen deleting a missing attribute/item withraising=False.Previously:
delattr(..., raising=False)anddelitem(..., raising=False)did not record the missing state.undo()would not reliably restore the original missing state.This change records
NOTSETfor those delete calls, and makesundo()tolerant when the target attribute is already absent.Closes #14094.
Why this matters
Tests that use non-raising deletes expect monkeypatch teardown to fully restore pre-test state. Without this fix, state could leak after tests.
How tested
uv run -m pytest testing/test_monkeypatch.py -k "delattr_non_existing_with_raising_false or delitem_non_existing_with_raising_false or test_delattr or test_delitem"uv run -m pytest testing/test_monkeypatch.pyuv run --with pre-commit pre-commit run --files src/_pytest/monkeypatch.py testing/test_monkeypatch.py changelog/14094.bugfix.rst