What to unit test in frontend?

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Most of the articles I find online is explaining 'how' to unit test but I want to know 'what' to unit test. How do you decide this?

It doesn't make sense to me. I feel like unit testing is made for the backend. It's hard to wrap my head around why and 'what' I would test in the frontend except some frontend JS logic (including things like Redux actions, whether an API call is making the right changes in the UI, etc.). However, I can't see what I would unit test in the 'visual' realm of the things, such as how a layout 'looks' on different devices, the CSS and HTML etc.

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Posted: 4 years ago
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