@Test
    public void testRunStartServerSpot()throws Exception{
        ParkedUsers garage = ParkedUsers.getInstance();
        ParkingSpot spotRef = garage.searchBySpotNumber("101");
        
        assertEquals(null,spotRef.getPrintWriter());
        
        AccessControlServer server = new AccessControlServer(1929);
        server.start();
        SpotStub spot = new SpotStub("101",1929);
        spot.start();
        
        sleep(1000);
        
        assertNotEquals(null,spotRef.getPrintWriter());
    }