TST: Fix warnings from Pillow for unavailable features #31014
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If Pillow is old enough to not support a feature _at all_, then it will warn about it. If you're running the whole test suite, then something else seems to cause pytest to treat it as benign. But if you run only `test_agg.py`, then our `-Werror` setting will cause it to fail test collection.
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timhoffm
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Jan 24, 2026
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PR summary
If Pillow is old enough to not support a feature at all, then it will warn about it (e.g., https://github.com/matplotlib/matplotlib/actions/runs/21232201791/job/61092807364#step:13:182). If you're running the whole test suite, then something else seems to cause pytest to treat it as benign. But if you run only
test_agg.py, then our-Werrorsetting will cause it to fail test collection.PR checklist