it('check that mouse position information is stored on mouse move', () => {
    const testHandlers = {
        onMouseMove: (mousePosition) => { return mousePosition; }
    };
    let spy = expect.spyOn(testHandlers, 'onMouseMove');

    const map = ReactDOM.render(
        <LeafletMap id="mymap" center={{y: 40.0, x: 10.0}} zoom={10} onMouseMove={testHandlers.onMouseMove} />,
        document.getElementById("container")
    );
    expect(map).toExist();

    ReactTestUtils.Simulate.mouseMove(document.getElementById("container"), {clientX: 0, clientY: 0, screenX: 0, screenY: 0});
    expect(spy.calls.length).toBe(1);
});