@Test
public void testSetQuantity() {
freshWater.setQuantity(85);
assertEquals(85, freshWater.getQuantity());
ultraBall.setQuantity(50);
assertEquals(50, ultraBall.getQuantity());
}
@Test
public void testGetQuantity() {
assertEquals(2, ultraBall.getQuantity());
assertEquals(100, freshWater.getQuantity());
assertEquals(40, maxRevive.getQuantity());
}