Hi all. Has anyone been able to get provider tests (as a unit test, with dependencies/upstream services mocked) working with NextJS + typescript + vitest or jest?

I don’t know NestJS very well, but I can’t see how vitest/jest would impact the ability to do that. What problem are you having?

Hi Matt. Using vitest, mocks or spies not taking effect when we progrmatically start the server for a provider test. Before you say "check vitest": 1. I've already tried / searched, the closest thin I can find is this but the NextJS custom server example doesn't touch testing, and the NextJS vitest example doesn't deal with mocks or custom servers 2. I can get vitest's mocks & spies to work in the context of other unit tests (e.g. mocking fetch when testing a function directly) I've also tried with jest but the result was worse (the custom server refused to start).

Is there a way you can use other forms of DI to replace components during testing?

I also don't know NextJS very well and I've been told no but if you know of a way I would be keen to try it.

hmm that doesn’t sound right. The ability to swap in/out dependencies should be something you can do independent of the framework you’re using.

let me see if I can put something together