Test handler functions that use useState hook.

[canyener]

 test('useStateTest', () => {
   const setState = jest.fn()
   const useStateMock: any = (initialState: any) => [initialState, setState]
   
  jest.spyOn(React, 'useState').mockImplementation(useStateMock)
  
  //how to trigger useState handler function here?

   const wrapper = mount(<ActivityList activities={fakeActivities} selectActivity={() => { }}/>)
   wrapper.find('Button').first().simulate('click')

   wrapper.update()

   expect(setState).toHaveBeenCalledTimes(1)
 })