@Override
 public void equalsAndHashCode() {
   super.equalsAndHashCode();
   Verify.assertInstanceOf(
       UnmodifiableSortedBag.class,
       SerializeTestHelper.serializeDeserialize(
           this.newWith(Comparators.reverseNaturalOrder(), 1, 2, 3)));
   Verify.assertInstanceOf(
       UnmodifiableSortedBag.class,
       SerializeTestHelper.serializeDeserialize(this.newWith(1, 2, 3)));
 }