jest not implemented window.alert()

Question

i have written test for my api with jest . i added function that calls my api in test file as below:

import AuthManager from \"../Client/Modules/Auth/AuthMan         


        

Answer 1

How I solved this problem is actually define the window.alert method at the top of the test file as a jest spy. This should work for any window method (in my case I was actually testing window.open).

Be sure to call mockClear() in your test, since this is a global object and it's calls will persist across tests.

window.alert = jest.fn();

test("login api resolves true", () => {
  window.alert.mockClear();
  /* ... */
})