fetch.resetMocks not resetting fetch

[boazhoch]

So as the title implies fetch.mockResets() isn't resetting the the fetch.

here is my full test.js:

import Worker from '../statistics-worker/worker';
jest.mock("../statistics-worker/worker");
const workerInitProps = {
  interactionId: '123',
  interactionSubmissionUrl: 'submission',
  fetchUrl: 'fetch'
};
const statService = Statistic.getNewInstance(new Worker(workerInitProps));
describe('Statistic serivce ', () => {
  beforeEach(() => {
    fetch.resetMocks();
  });
  it('Should init worker', () => {
    expect(statService).toBeInstanceOf(Statistic);
  });
  it('should fetch statistics', () => {
    fetch.mockResponseOnce(
      JSON.stringify({
        payload: {
          statistics: {
            1: 10,
            2: 11
          },
          count: 10,
          finalResults: []
        }
      })
    );
    statService
      .fetchStatistics()
      .then(res => {
        expect(res).toEqual({
          statistics: {
            1: {
              options: 10,
              totalVotes: 0
            },
            2: {
              options: 11,
              totalVotes: 0
            }
          },
          count: 10,
          finalResults: []
        });
      })
      .catch(err => {
        expect(err).toBeFalsy();
      });
  });

  it('should deadlock fetch statistics', () => {
    fetch.mockRejectOnce(new Error('fake error message'));

    const statistics = Statistic.getNewInstance(new Worker(workerInitProps));
    statService
      .fetchStatistics()
      .then(res => {
        console.log(res);
        expect(res).toEqual({
          count: 0,
          statistics: {},
          dead: true
        });
      })
      .catch(err => {
        expect(err).toBeFalsy();
      });
  });
});

The result i get is:

Expected value to equal:
  {"count": 0, "dead": true, "statistics": {}}
Received:
  {"count": 10, "finalResults": [], "statistics": {"1": {"options": 10, "totalVotes": 0}, "2": {"options": 11, "totalVotes": 0}}}

[jefflau]

Did you manage to fix this? I finally had some time recently to look through the example. I'm a bit confused why it's going into the .then when it should just hit the catch if you're rejecting.

[zoechi]

Struggling with this here as well, always returns the value provided in the first test with mockOnce(...) even for one of the tests where I use fetchMock.mockRejectOnce()

Looks like the request URL needs to be different to get different response. I find this quite confusing. Setting a mock response in one test should not be returned in another test. Even resetMocks() has no effect.

[nizur]

Has anyone been able to work this one out? Running into this issue myself. The mocked response is always from the test run previously. resetMocks doesn't seem to do anything.

[Brawl345]

For anyone stumbling upon this: Save yourself the hours of troubleshooting and just use msw: https://mswjs.io/docs/integrations/node/

resetMocks() in this lib definitely doesn't work which makes it useless for anyone developing real software tests.