We have been banging our heads against the wall trying to test the AdvancedMarkerElement from the google maps api. We replaced google.maps.Markers with AdvancedMarkerElement. The tests we had originally were using @googlemaps/jest-mocks' and we mocked the listener and then called it directly using addListenerSpy.mock.calls[0][1]() and then assert that the proper calls were made. Below is the test which was working with Markers