Ask HN: Jest is so slow. Why Jest?

• node-test-runners-performance-comparison

  3 11 7.1 JavaScript

  Node test runners performance comparison

I've been running some performance comparison of different JavaScript test runners [1]. Jest comes out woefully behind everything else. To me personally that's a show stopper. However, Jest is popular and so I am clearly missing something. Looking through Github issues, it's also clear that addressing performance is not a priority. What is the priority? Who is Jest appealing to?

I'd really love to hear from people who, given a green light on tech choices, would pick Jest over, say, mocha or tape for their next project. Thank you!

[1] https://github.com/artemave/node-test-runners-benchmark

• comparing-javascript-test-runners

  1 66 0.0 JavaScript

  Comparing AVA, Jest, Mocha, and mocha-parallel-tests testing frameworks

I did a comparison of Ava, Mocha, and Jest test runners: https://github.com/scraggo/comparing-javascript-test-runners

Jest is the slowest if running tests in parallel with Mocha >=8. Mocha is the slowest in its default serial mode.

My conclusion with Jest was this:

"Jest is recommended if you want to get tests up and running quickly. It has everything built in and requires very little configuration. The command line and GUI experience is unmatched. Finally, it's the most popular and makes an excellent pair with React."

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