Fix auto_close preventing image cache call

[edabor]

Closes #172

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.34%. Comparing base (00f3018) to head (4010683).
⚠️ Report is 55 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #201      +/-   ##
==========================================
+ Coverage   95.31%   95.34%   +0.03%     
==========================================
  Files           2        2              
  Lines         256      258       +2     
  Branches       39       39              
==========================================
+ Hits          244      246       +2     
  Misses          6        6              
  Partials        6        6              

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[user27182]

Thanks! Coverage is reporting 3 lines missing but it seems broken after #196 merged

[user27182]

I tried this patch with --disallow_unused_cache in #199 and it resolved 16/17 callback errors. But one error still persists with test_screenshot_notebook
https://github.com/pyvista/pytest-pyvista/actions/runs/17352748316/job/49261538806?pr=199

============================= pytest-pyvista ERROR =============================
Unused cached image file(s) detected (1). The following images are
cached, but were not generated or skipped by any of the tests:
['screenshot_notebook.png']

This is the test:
https://github.com/pyvista/pyvista/blob/7e531e3dadd2d78e75a5790be884172ab87c7331/tests/plotting/test_plotting.py#L3116-L3126
It doesn't use auto_close, so not strictly related to #172, but the test uses a fixture specifically to allow unused images, yet an unused image error is being raised.

[edabor]

I tried this patch with --disallow_unused_cache in #199 and it resolved 16/17 callback errors. But one error still persists with test_screenshot_notebook https://github.com/pyvista/pytest-pyvista/actions/runs/17352748316/job/49261538806?pr=199

============================= pytest-pyvista ERROR =============================
Unused cached image file(s) detected (1). The following images are
cached, but were not generated or skipped by any of the tests:
['screenshot_notebook.png']

This is the test: https://github.com/pyvista/pyvista/blob/7e531e3dadd2d78e75a5790be884172ab87c7331/tests/plotting/test_plotting.py#L3116-L3126 It doesn't use auto_close, so not strictly related to #172, but the test uses a fixture specifically to allow unused images, yet an unused image error is being raised.

Something very tricky happened here.

No call to the fixture is expected due to verify_image_cache_wrapper.allow_useless_fixture = True, which is indeed occurring because the teardown of no_images_to_verify does not detect any call to the fixture (ie. n_calls == 0).

However, because the plotter is not closed (hard to tell but maybe because of the notebook = True), the check_gc fixture is closing the plotter at teardown.
Therefore, the callback is called and an image is generated, which was stored in the cache when writing the test originally.

https://github.com/pyvista/pyvista/blob/2208861be4edff692c328703f7c245e56e2084c1/tests/plotting/conftest.py#L60-L71

Two options:

1. add the @pytest.mark.skip_check_gc mark to the test and remove the file from the cache
2. remove the @pytest.mark.usefixtures('no_images_to_verify') mark and add a pl.close() to make sure the plot is closed by the test and not the check_gc fixture

I vote for option 2

The conclusion is also that the current PR is not responsible of this failure.

[akaszynski]

remove the @pytest.mark.usefixtures('no_images_to_verify') mark and add a pl.close() to make sure the plot is closed by the test and not the check_gc fixture

Option 2 seems more explicit. Let's go with that.

[akaszynski]

LGTM aside from a nitpick.

[user27182]

remove the @pytest.mark.usefixtures('no_images_to_verify') mark and add a pl.close() to make sure the plot is closed by the test and not the check_gc fixture

Option 2 seems more explicit. Let's go with that.

Confirmed that this works. CI is green with the --disallow_unused_cache option enabled in #199 when using the patch from pyvista/pyvista#7886