assertEquals(HashMultiset.create(asList("a", "b", "a", "c")), multiset1);
    assertEquals(HashMultiset.create(asList("a", "b", "a", "c", "c")), multiset2);
    assertTrue(
        ((RegularImmutableList<String>)
                    ((RegularImmutableSortedMultiset<String>) multiset1).elementSet.elements)
                .array
            != builder.elements);
  }

  public void testBuilderAddAll() {