@Test
public void testMixingTwoLiquids() {

    LinkedList<Liquid> liquids = new LinkedList<>();
    liquids.add(new Liquid(100, 350, new Color(0x000000)));
    liquids.add(new Liquid(100, 300, new Color(0xfefefe)));
    Liquid result = new SubtractiveMixingStrategy().mixLiquids(liquids);
    assertEquals(new Liquid(200, 325, new Color(0x7f7f7f)), result);
}