Jest worker encountered 4 child process exceptions, exceeding retry limit

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I had experienced this as well, and this issue thread led me in the right direction. Two things to try:

  1. You could try adding the --maxWorkers 2 to your jest test command.

  2. This error seems to be a mix of a few problems, but uncaught promise rejections are a player. You could also try using waitFor and see if this helps.

    import { waitFor } from 'test/test-utils'

test("signupAsUser logs results if email is provided", async() => {
  const consoleSpy = jest.spyOn(console, "log");
  const email = ref("testuser@scoutapm.com");
  const {
    signupAsUser
  } = useSignup(email);

  await waitFor(() => signupAsUser());

  expect(consoleSpy).toHaveBeenCalledWith("USER:", mockSignup);
});

  3. This answer shed more light.

    Digging deeper, this is because findBy tests return a promise so the await is needed. https://testing-library.com/docs/guide-disappearance/#1-using-findby-queries
    It would have been nice for the library to throw a better error however.

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