Unit testing for undici.fetch

[jennyEckstein]

I am building Node.js http-client that uses undici.fetch under the hood. I am looking for a solution like nock. I see that undici has MockClient for that purpose. Should I use MockClient if I am using undici.fetch, or is it only for non-fetch undici?

So far I tried 'fetch-mock-jest', it seems to do the job but not well. I would love to hear your recommendation about how to test properly.

jest.mock('undici', () => ({
  ...jest.requireActual('undici'),
  fetch: jest.fn(() => require('fetch-mock-jest').sandbox())
}));

[mcollina]

I would recommend to follow https://undici.nodejs.org/#/docs/best-practices/mocking-request. All things apply to fetch as request as they are underpinned by the same logic.