jest-expo with waitFor and modern timers

Expo SDK
1

When using the jest-expo preset. I can’t seem to get modern timers to work with waitfor. Without the preset, it appears to work. Also it has been fixed with @testing-library/react-native as well, but the fix they have for the timer does not appear to work.

For example:

  it("should work when starting at zero seconds", async () => {
    jest
      .useFakeTimers('modern')
      .setSystemTime(new Date('2020-01-01T00:00:00Z').getTime());

    const { getByTestId } = render(<MyComponent />)
    await waitFor(() => {
      expect(getByTestId("test").textContent).toEqual(new Date('2020-01-01T00:00:00Z').getTime().toString());
      expect(renderCallback.mock.calls.length).toEqual(1);
    });
   // hangs at this point then does not complete the test.

For the time being I hacked up a solution with jest.config.js

2

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