Как через Jest протестировать функцию внутри которой fetch()?

const body = document.getElementsByTagName('body') as HTMLCollectionOf<HTMLElement>;
 
/*** This's a handlers for the Events */
EventsAutorization(e: MouseEvent | KeyboardEvent) {
  if (((....).type === "submit"
    || ((....).key === 'Enter')) {
    e.preventDefault();
 
 
    const formAuthorisation = (body[0].querySelector('.author') as HTMLElement);
    /* remove a form uatрorization */
 
    /* public form input type=text for will send the message into the chat. */
    let newPerson: any; // It's one a new User
    const req = new fetchRequest();
        req.loadExistencesLogins().then(...)
       .....

test.each([
     ["sendLoginStr: a new one login's name=> ['Demo']", 'Demo', 200],
   ])(`.add(%s)`, (a, b, expected) => {
 
    sendLoginStr(b)
        .then((respons) => {
            expect(respons.json()).toBe(expected);
        })

import { APIRequest } from './api'
 
describe('testing api', () => {
  beforeEach(() => {
    fetch.resetMocks()
  })
 
  it('calls google and returns data to me', async () => {
    fetch.mockResponseOnce(JSON.stringify({ data: '12345' }))
 
    //assert on the response
    const res = await APIRequest('google')
    expect(res.data).toEqual('12345')
 
    //assert on the times called and arguments given to fetch
    expect(fetch.mock.calls.length).toEqual(1)
    expect(fetch.mock.calls[0][0]).toEqual('https://google.com')
  })
})