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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"asyncio unix events test doesn't restore mocked unix_events.can_use_pidfd","articleBody":"# Bug report\r\n\r\nin `test_asyncio.test_unix_events.PolicyTest.test_get_default_child_watcher`, `unix_events.can_use_pidfd` is mocked within the test body, but never restored to the original function.\r\n\r\nthis doesn't cause test failures during regular test runs, but during a refleak test run on MacOS it a `AttributeError: module 'os' has no attribute 'pidfd_open'` to be thrown (presumably due to another test using the non-mocked function in the second iteration).\r\n\r\nrepro:\r\n\r\n```\r\n./python.exe -m test test_asyncio -m '*.test_unix_events.*' -R 2:2\r\nWARNING: Running tests with --huntrleaks/-R and less than 3 warmup repetitions can give false positives!\r\n0:00:00 load avg: 3.79 Run tests sequentially\r\n0:00:00 load avg: 3.79 [1/1] test_asyncio\r\nbeginning 4 repetitions\r\n1234\r\n.Process ForkProcess-10:\r\nTraceback (most recent call last):\r\n...\r\n...\r\nAttributeError: module 'os' has no attribute 'pidfd_open'\r\n...\r\n...\r\n```\r\n\r\nthis can be fixed by patching instead of mocking in the `test_get_default_child_watcher` test (PR coming up).\r\n\r\n# Your environment\r\n\r\n- CPython versions tested on: main\r\n- Operating system and architecture: MacOS x86-64\r\n\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-103782\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/itamaro","@type":"Person","name":"itamaro"},"datePublished":"2023-04-24T18:28:56.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/103780/cpython/issues/103780"}