confused .rejects example in Jest document

[Jongmun-Park]

Hi.
I learned about .rejects function in Jest document example
https://jestjs.io/docs/en/tutorial-async#rejects

here is the example.

// Testing for async errors using `.rejects`.
it('tests error with rejects', () => {
  expect.assertions(1);
  return expect(user.getUserName(3)).rejects.toEqual({
    error: 'User with 3 not found.',
  });
});

// Or using async/await with `.rejects`.
it('tests error with async/await and rejects', async () => {
  expect.assertions(1);
  await expect(user.getUserName(3)).rejects.toEqual({
    error: 'User with 3 not found.',
  });
});

The example used expect.assertions(1);
but, i searched that it is necessary to use assertions with .rejects
then i found this issue 'removed useless expect.assertions'
#7131

so i suggest how about removing expect.assertions(1); code in the example.
becauese i was not sure whether I should used assertions.

thank u.

[joelbarbosa]

Yes you are right, that code expect.assertions(1); is usuless that. As the rejects will always to occur here. I think its a good first commit.

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