Update CI MacOS to fix notebook test error

[smburdick]

Description

Address issue #6336 for macOS.

Testing

./check/pytest-changed-files -n auto --ignore=cirq-core/cirq/contrib --enable-slow-tests --verbose

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6ea5ae1) 97.80% compared to head (77ecc83) 97.80%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6366      +/-   ##
==========================================
- Coverage   97.80%   97.80%   -0.01%     
==========================================
  Files        1111     1111              
  Lines       96878    96878              
==========================================
- Hits        94756    94755       -1     
- Misses       2122     2123       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[pavoljuhas]

LGTM, but let us check the CI here rather than waiting for the next daily run.

[pavoljuhas]

Can we temporarily comment out this slow mark to include the test in this PR checks?

If the checks pass, let's put the mark back and merge.

[smburdick]

Can you explain what you mean by check the CI here? I thought the PR checks were handling that, but I could be mistaken

[pavoljuhas]

If test is decorated with @pytest.mark.slow it is not included in the CI checks executed for the PR and instead runs in scheduled daily workflows. Removing/commenting the slow mark will run the test in PR checks and we'll know if the fix worked sooner.

[smburdick]

In failed changed files test:

---------------------------------------------------------------------------
Exception encountered at "In [2]":
---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
Cell In[2], line 5
      2 import networkx as nx
      4 import cirq
----> 5 import quimb
      6 import quimb.tensor as qtn
      7 from cirq.contrib.svg import SVGCircuit

ModuleNotFoundError: No module named 'quimb'

Let's add the quimb module to the requirements (or include Cirq/cirq-core/cirq/contrib/requirements.txt)

[smburdick]

The checks passed with the slow mark removed: https://github.com/quantumlib/Cirq/actions/runs/7064136655/job/19231563262?pr=6366

I will restore the slow mark and push.

[smburdick]

=========================== short test summary info ============================
FAILED dev_tools/notebooks/notebook_test.py::test_notebooks_against_cirq_head[/home/runner/work/Cirq/Cirq/examples/stabilizer_code.ipynb] - Failed: Notebook failure: stabilizer_code.ipynb, please see out/examples/stabilizer_code.out.ipynb for the output notebook (in Github Actions, you can download it from the workflow artifact 'notebook-outputs')
=================== 1 failed, 55 passed in 502.08s (0:08:22) ===================

I downloaded the artifacts, but don't see that file in the zip.

[smburdick]

Retriggered the checks and that problem went away.

[pavoljuhas]

Suggested change

	@pytest.mark.skipif(sys.platform not in ["linux", "darwin"], reason="Linux/Mac-only test")
	@only_on_posix

please reuse the existing decorator from dev_tools.test_utils import only_on_posix
Otherwise LGTM, thank you!

[smburdick]

Done.

[pavoljuhas]

LGTM after a small correction. Thank you!