I can tell that I do love watching them, but I don't think that they are necessary 100% especially if you are testing while coding,
I have used jest for integration, but never for unit.
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Jest is great for unit tests, and some integration tests.
Cypress is amazing for end-to-end testing. I love watching it open a browser, and interact with my site in a full-fledged UI.
Biggest reason tests take time away from dev sometimes is because of how much I just love watching them run 😅
I can tell that I do love watching them, but I don't think that they are necessary 100% especially if you are testing while coding,
I have used jest for integration, but never for unit.