.toHaveReturned()

Also under the alias: .toReturn()

If you have a mock function, you can use .toHaveReturned to test that the mock function successfully returned (i.e., did not throw an error) at least one time. For example, let's say you have a mock drink that returns true. You can write:

test('drinks returns', () => {
  const drink = jest.fn(() => true);
  drink();
  expect(drink).toHaveReturned();
});