https://github.com/matplotlib/pytest-mpl might also be interested in this feature.

I'm very close to having everything working, but I'm having to remove the text to get things to compare properly on circleci. Which is fine for the most part, but for one of my tests I can't remove the text. I am getting a:

Could not set locale to English/United States. Some date-related tests may fail
    "Could not set locale to English/United States. "

message, but I don't think that is the issue.

I'm not sure what's causing the test to render so differently.

I am using matplotlib.testing.setup() which should set the font....

Might be a freetype issue, see https://matplotlib.org/devel/contributing.html#building-matplotlib-for-image-comparison-tests

Alright, I have something that works for me over at animatplot. You can see my implementation here. It's as simple as using a decorator on a function that returns an animation. Internally, it will use the BunchOFiles writer to save the animation, and then loop over the images for comparison. Unfortunately, it does require specifying how many frames to expect.

This would require some additional work to suit matplotlib's needs.

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