Why isn't jest's clearAllMocks working and how do I clear mocks for jest spies?

Question

I'm using jest 4.2.4 with my React 16.13.0 application. I have set up this type of mock ...

  jest.spyOn(ReduxFirebase, "getFirebase").mockReturnValue({
    firestore: jest.fn(() => ({ collection: jest.fn(() => collection) })),
  });

How do I clear this between tests? I tried this ...

describe("User", () => {
  afterEach(() => {
    jest.clearAllMocks();
  });

but it is not working. Setting this later in the test suite

  jest.spyOn(ReduxFirebase, "getFirebase").mockReturnValue({
    firestore: jest.fn(() => ({ collection: jest.fn(() => collection2) })),
  });

does not take (the original spy is still in place.

The question isn't specific enough. How do you know that it doesn't work? What do you expect and what do you get? — Estus Flask, Apr 30 '20 at 09:57

score 6 · Answer 1 · answered Apr 29 '20 at 16:56

6

This should do the job :

const getFirebaseMock = jest.spyOn(ReduxFirebase, "getFirebase").mockReturnValue({
  firestore: jest.fn(() => ({ collection: jest.fn(() => collection) })),
});
getFirebaseMock.mockRestore();

answered Apr 29 '20 at 16:56

Thanks. Currently I'm not savinga reference to that anywhere. Is there any way I can start out the test suite (or an individual test) with a clean state without saving any state from anything before? – Dave Apr 29 '20 at 17:19
I'm not sure you can if `clearAllMocks` does not work. You'll probably need to define your spy before the test suite, mock implementation in each test and use `afterEach(getFirebaseMock.mockRestore)` – Apr 29 '20 at 17:35
Apart from this case you can't clear your mock to retrieve the originally state. Besides an issue has been opened, check here https://github.com/facebook/jest/issues/7136 – jonn Dec 29 '20 at 19:46

score 5 · Answer 2 · answered Aug 10 '22 at 15:03

5

You can try

afterEach(() => {
    jest.restoreAllMocks();
  });

answered Aug 10 '22 at 15:03

Dani Alcalà

212
3
5

1

worked, thank you – Ismoil Shokirov Jun 16 '23 at 17:09

Why isn't jest's clearAllMocks working and how do I clear mocks for jest spies?

2 Answers2