@Test
public void subtract() {
assertEquals(HardSoftScore.of(21, 280),
HardSoftScore.of(20, -20).subtract(
HardSoftScore.of(-1, -300)));
assertEquals(HardSoftScore.ofUninitialized(-63, 21, 280),
HardSoftScore.ofUninitialized(-70, 20, -20).subtract(
HardSoftScore.ofUninitialized(-7, -1, -300)));
}