Probably the best way to test things like that is with a visual regression testing tool [1][2]. In practice these are difficult to get right and tend to produce

Probably the best way to test things like that is with a visual regression testing tool [1][2]. In practice these are difficult to get right and tend to produce a lot of false positives and negatives. See for instance Huxley [3] [1]: https://github.com/BBC-News/wraith https://github.com/BBC-News/wraith [2]: https://percy.io/ https://percy.io/ [3]: https://github.com/facebookarchive/huxley https://github.com/facebookarchive/huxley