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[Test] Make the Hydra config tests pass on pytest 9.2 - #4640
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bsprenger merged 1 commit intoOct 30, 2026
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pytest 9.2 deprecates module-scoped fixtures defined as instance methods. test_configs.py turns every warning into an error, so that warning from init_hydra made all 21 TestHydraParsing tests error at setup on Python 3.10 to 3.13. Make the fixture a classmethod, as pytest suggests. It does not use self.
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/4640
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Thanks @peterdsharpe 🫶 !
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Description
Since pytest 9.2.0 came out on 2026-10-27, all 21
TestHydraParsingtests intest/test_configs.pyerror at setup on Python 3.10 to 3.13. That fails the CPUbulkjobs on main (tests-cpu (3.10, bulk)) and on every open PR. Python 3.14 passes only because the class is skipped there.pytest 9.2 deprecates module-scoped fixtures defined as instance methods, with a
PytestRemovedIn10Warning.init_hydrais one of them, andtest_configs.pyturns every warning into an error (pytestmark = pytest.mark.filterwarnings("error")). This PR makesinit_hydraa classmethod, as the warning suggests. The fixture does not useself.Checked locally on CPU with Python 3.12, tensordict main and
BATCHED_PIPE_TIMEOUT=60, as in CI. With pytest 9.2.0, main gives 21 errors at setup and this branch passes all 21 tests. With pytest 9.1.1, this branch passes all 21 too.Other fixtures in the test suite are written the same way. They only warn, because their files do not turn warnings into errors.
Motivation and Context
No issue raised: the change only touches one test fixture, and the CI logs show the failures.
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