running tests on GitHub and getting the error message below. Weirdly, this error did not occur with the same setup before.
Run python -m tox -- --junit-xml pytest.xml
py38: install_deps> python -I -m pip install pytest pytest-benchmark pytest-xdist
tox: py38
py38: commands[0]> pytest tests/ --ignore=tests/lab_extension --junit-xml pytest.xml
ImportError while loading conftest '/home/runner/work/quibbler/quibbler/tests/conftest.py'.
tests/conftest.py:6: in <module>
from matplotlib import pyplot as plt
E ModuleNotFoundError: No module named 'matplotlib'
py38: exit 4 (0.87 seconds) /home/runner/work/quibbler/quibbler> pytest tests/ --ignore=tests/lab_extension --junit-xml pytest.xml pid=1849
py38: FAIL code 4 (4.01=setup[3.14]+cmd[0.87] seconds)
evaluation failed :( (4.10 seconds)
Error: Process completed with exit code 4.
Link to the failed test:
https://github.com/Technion-Kishony-lab/quibbler/actions/runs/3792710874/jobs/6449140682#step:5:19
Did something change recently in tox? What to do?
tox version 4 has been released a couple of weeks ago.
There were a couple of breaking changes, see https://tox.wiki/en/latest/faq.html#breaking-changes-in-tox-4
I would recommend to create an issue at https://github.com/tox-dev/tox/issues
In the meantime, to get your CI unblocked, I would recommend to pin tox < 4 in your github actions.