/** Az életpontot módosító metódusok tesztelése. */
 @Test
 public void testLifepoint() {
   player.setLifepoints(8000);
   player.subLifepoints(500);
   assertEquals(7500, player.getLifepoints());
   player.addLifepoints(1000);
   assertEquals(8500, player.getLifepoints());
   player.subLifepoints(9000);
   assertEquals(0, player.getLifepoints());
 }