@Test
public void testNoAmount() {

    LinkedList<Liquid> liquids = new LinkedList<>();
    liquids.add(new Liquid(0, 300, new Color(0x000000)));
    liquids.add(new Liquid(0, 300, new Color(0xfefefe)));
    Liquid result = new SubtractiveMixingStrategy().mixLiquids(liquids);
    assertEquals(0, result.getAmount(), 0.00001);
}