I am trying to test a function that returns a moment Object to see if it is returning the correct time, when I try to do something like this:

const moment = require('moment');

const setsTime = (testFn) => {
  testFn(moment.utc('2020-01-01'));
};

test('sets Correct time', () => {
  const mockFn = jest.fn();
  setsTime(mockFn);
  expect(mockFn).toHaveBeenCalledWith('2020-01-01T00:00:00.000Z');
});

I get:

expect(jest.fn()).toHaveBeenCalledWith(...expected)

Expected: "2020-01-01T00:00:00.000Z"
Received: "2020-01-01T00:00:00.000Z"

How do I solve this? if I put moment.utc('2020-01-01T00:00:00.000Z') in the toHaveBeenCalledWith section I still don’t get the match as the received section just becomes the huge moment object.