How to properly make mock throw an error in Jest?

Question

I\'m testing my GraphQL api using Jest.

I\'m using a separate test suit for each query/mutation

I have 2 tests (each one in a separate test suit) where I mock on

Answer 1

For Angular + Jest:

import { throwError } from 'rxjs';

yourMockInstance.mockImplementation(() => {
  return throwError(new Error('my error message'));
});

Answer 2

Change .mockReturnValue with .mockImplementation:

yourMockInstance.mockImplementation(() => {
  throw new Error();
});