René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Unit handling needs many more tests","articleBody":"### Problem\r\n\r\nI've gone down a bit of a rabbit hole with #17930, and I've noticed that our testing for units is rather sparse. `lib/matplotlib/tests/test_units.py` only really checks `plot`, `scatter`, `axhline`, `axvline`, and `bar`, but we have many more artists that are peppered with unit conversion handling.\r\n\r\n### Proposed Solution\r\n\r\nWe need to expand `test_units.py` to cover almost all artist-creating functions that need to handle units. Now we have `check_figures_equal`, so we can do something about it that doesn't explore the number of test images, with a plot reference figure with non-unit functions, and a plot test figure with unitized functions.\r\n\r\nI don't really understand what the _expected_ unit conversion interface is, so I don't know how exactly to write the tests. I tried to do one for `errorbar` using `Quantity`, but it didn't work and I don't know if that's because `Quantity` does not implement enough for the unit registry, or whether `errorbar` doesn't correctly handle units.","author":{"url":"https://github.com/QuLogic","@type":"Person","name":"QuLogic"},"datePublished":"2020-08-18T04:44:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/18278/matplotlib/issues/18278"}