@Test
void cannot_modify_track_externally() {

    Route route = new Route(vehicle, depot, Arrays.asList(visit1, visit2));
    ArrayList<List<Coordinates>> track = new ArrayList<>();
    track.add(Arrays.asList(Coordinates.valueOf(1.0, 2.0)));
    List<List<Coordinates>> routeTrack = new RouteWithTrack(route, track).track();
    assertThatExceptionOfType(UnsupportedOperationException.class)
            .isThrownBy(routeTrack::clear);
}