public void unregisterWithBrokenModel() {
manager.add(new GraphRoadModel(new MultimapGraph<LengthData>(), SI.METER,
SI.METERS_PER_SECOND));
manager.add(new BrokenRoadModel(new MultimapGraph<LengthData>()));
manager.configure();
manager.unregister(new RoadUser() {
@Override
public void initRoadUser(RoadModel model) {}
});
}