assertEquals(false, sub.containsValue(firstValue));
Object secondValue = sub.remove(second);
assertEquals(1, sub.size());
assertEquals(size - 2, sm.size());
assertEquals(size - 2, sm.inverseBidiMap().size());
assertEquals(false, sm.containsKey(second));
assertEquals(false, sm.containsValue(secondValue));
assertEquals(false, sm.inverseBidiMap().containsKey(secondValue));
assertEquals(false, sm.inverseBidiMap().containsValue(second));
assertEquals(false, sub.containsKey(second));