sapegin / jest-cheat-sheet Goto Github PK

Use your cheat sheet from time to time, would love to see some information on mockReturnValue/mockResolveValue etc.

I took the liberty of writing some info about them locally, but I do not have the permissions to submit a PR

I added the following section (under mocks):

Returning, resolving and rejecting values

Your mocks can return values:

const callback = jest.fn().mockReturnValue(true);
const callbackOnce = jest.fn().mockReturnValueOnce(true);

Or resolve values:

const promise = jest.fn().mockResolvedValue(true);
const promiseOnce = jest.fn().mockResolvedValueOnce(true);

They can even reject values:

const failedPromise = jest.fn().mockRejectedValue("Error");
const failedPromiseOnce = jest.fn().mockRejectedValueOnce("Error");

You can even combine these:

const callback = jest.fn()
  .mockReturnValueOnce(false)
  .mockReturnValue(true);

// ->
//  call 1: false
//  call 2+: true

See #15

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