plot tests: each image is now a separate test#202
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Matplotlib's image_comparison decorator can compare multiple images, but it raises an exception on the first mismatched image, aborting the test. This is annoying, since a test needs to be re-run multiple times to update all its baseline images. Implement a custom pytest collector to treat each image comparison as a separate test, so e.g. plotnine updates can be handled in a single run.
arberqoku
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Jun 9, 2026
ilia-kats
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Matplotlib's image_comparison decorator can compare multiple images, but it raises an exception on the first mismatched image, aborting the test. This is annoying, since a test needs to be re-run multiple times to update all its baseline images.
This PR implements a custom pytest collector to treat each image comparison as a separate test, so e.g. plotnine updates can be handled in a single run.