Error: Not implemented: window.alert
//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();
/* ... */
})
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