Could we use Vitest over Jest?

[CocoisBuggy]

My suspicion is that vitest would let us clean up a lot of the test infrastructure using their fixtures. I have strange issues with jest that I consistently cannot explain and it is definitely verrrry slow. I'll attach a PR to this issue so that some numbers can be put alongside this musing.

[vnugent]

I'm not familiar with Vite and also don't have a strong preference. Do we have to switch to vite for build as well? Can it be adopted incrementally?

[CocoisBuggy]

My experience with vitest has always been that it's a drop-in replacement for jest. Config is a little different (it uses the vite config style), but api is otherwise identical to jest/node test/bun test.

Vite is not required to use vitest. Vitest uses vite under the hood and is part of that same ecosystem.

I have a pretty specific idea in connection with adopting vitest, and my hope is that I can speed up the tests a lot. I'll create a PR for it at some point to explain my idea - I like to run tests as I code so speed is a big priority when I build test suites