@Test
 public void getTypeTestSHIELD() {
   Powerup p = new Powerup(100, 100, Powerup.PowerupType.SHIELD);
   assertTrue(p.getType() == Powerup.PowerupType.SHIELD);
 }
 @Test
 public void getTypeTestINSTANT() {
   Powerup p = new Powerup(100, 100, Powerup.PowerupType.INSTANT);
   assertTrue(p.getType() == Powerup.PowerupType.INSTANT);
 }