@Test
    public void laneElements(){
        int limit = 5;
        Lane l = new Lane();
        l.setCapacity(100);
        l.setDirection(Directions.IN);
        l.setLength(150);
        for (int i=0; i<limit; i++){
          l.addVehicle(new Vehicle());  
        }
        assertEquals(100, l.getCapacity());
        assertEquals(150, l.getLength());
        assertEquals(Directions.IN , l.getDirection());
        assertNotNull(l.getVehicles());
        assertEquals(limit, l.getVehicles().size());
    }