test mock calls jest code example

Example 1: jest spyon

// jest.spyOn(object, methodName)
const spy = jest.spyOn(video, 'play');

// jest.spyOn(object, methodName, accessType?)
const spy = jest.spyOn(video, 'play', 'get'); // we pass 'get'

Example 2: jest mock mockname

test("mockName", () => {
  const mockFn = jest.fn().mockName("mockedFunction");
  mockFn(); // comment me
  expect(mockFn).toHaveBeenCalled();
});