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doc/en/explanation/flaky.rst
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@ -40,9 +40,9 @@ Even in case of plugins which run tests in parallel, for example `pytest-xdist`_
It is of course possible (and common) for tests and fixtures to spawn threads themselves as part of their testing workflow (for example, a fixture that starts a server thread in the background, or a test which executes production code which itself spawns threads), but some care must be taken: It is of course possible (and common) for tests and fixtures to spawn threads themselves as part of their testing workflow (for example, a fixture that starts a server thread in the background, or a test which executes production code which itself spawns threads), but some care must be taken:
* Make sure to eventually wait on any spawned threads -- for example at the end of a test, or during teardown of a fixture. * Make sure to eventually wait on any spawned threads -- for example at the end of a test, or during teardown of a fixture.
* Avoid using primitives provided by pytest (:func:`pytest.warns`, :func:`pytest.raises`, etc) from multiple threads, as they are not thread-safe. * Avoid using primitives provided by pytest (:func:`pytest.warns`, :func:`pytest.raises`, etc) from multiple threads, as they are not thread-safe.
If your test suite uses threads and your are seeing flaky test results, do not discount the possibility that the test is implicitly using global state in pytest itself. If your test suite uses threads and your are seeing flaky test results, do not discount the possibility that the test is implicitly using global state in pytest itself.
Pytest features Pytest features
^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^