class CitySimulation extends AbstractSimulation {

    WorldState getWorldState(){
        return world;
    }

}

class CitySimulationTest {

    private static CitySimulation sim;
    private static int seed;
    private static int agentsPerTeam;
    private static int steps;
    private static int step;

    @Test
    public void chargingStationsWork(){

        //there is at least one charging station in the simulation
        assert !sim.getWorldState().getChargingStations().isEmpty();
    }

}