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quantumlib / Cirq

A Python framework for creating, editing, and invoking Noisy Intermediate Scale Quantum (NISQ) circuits.
Apache License 2.0
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Test failures in `_compat_test.py/test_deprecated_module` #6373

Closed maffoo closed 9 months ago

maffoo commented 9 months ago

I'm seeing failures in CI in _compat_test.py/test_deprecated_module: https://github.com/quantumlib/Cirq/actions/runs/7097897242/job/19318827306?pr=6372. The tests are not seeing expected log messages from a deprecation.

maffoo commented 9 months ago

I was initially unable to reproduce this locally, but when I updated my local virtualenv with

pip install --upgrade -r dev_tools/requirements.dev.env.txt

I was able to reproduce the failures. So it seems likely that a new version of a dependency is interacting in some way with multiprocessing and causing this problem, but I haven't narrowed down which dependency it is. After upgrading with the above command you can reproduce the problem with

pytest cirq-core/cirq/testing/ cirq-core/cirq/_compat_test.py