}

  public void testBuilderAddCopies() {
    ImmutableSortedMultiset<String> multiset =
        ImmutableSortedMultiset.<String>naturalOrder()
            .addCopies("a", 2)
            .addCopies("b", 3)
            .addCopies("c", 0)
            .build();
    assertEquals(HashMultiset.create(asList("a", "a", "b", "b", "b")), multiset);
  }

  public void testBuilderSetCount() {

  }

  public void testBuilderAddCopies() {
    ImmutableMultiset<String> multiset =
        new ImmutableMultiset.Builder<String>()
            .addCopies("a", 2)
            .addCopies("b", 3)
            .addCopies("c", 0)
            .build();
    assertEquals(HashMultiset.create(asList("a", "a", "b", "b", "b")), multiset);
  }

  public void testBuilderSetCount() {

  }

  public void testBuilderAddCopies() {
    ImmutableMultiset<String> multiset =
        new ImmutableMultiset.Builder<String>()
            .addCopies("a", 2)
            .addCopies("b", 3)
            .addCopies("c", 0)
            .build();
    assertEquals(HashMultiset.create(asList("a", "a", "b", "b", "b")), multiset);
  }

  public void testBuilderSetCount() {

   * <pre>{@code
   * public static final ImmutableSortedMultiset<Bean> BEANS =
   *     new ImmutableSortedMultiset.Builder<Bean>(colorComparator())
   *         .addCopies(Bean.COCOA, 4)
   *         .addCopies(Bean.GARDEN, 6)
   *         .addCopies(Bean.RED, 8)
   *         .addCopies(Bean.BLACK_EYED, 10)
   *         .build();
   * }</pre>
   *

            addCalls.incrementAndGet();
            return super.add(element, occurrences);
          }
        };
    ImmutableMultiset<String> adds =
        new ImmutableMultiset.Builder<String>().addCopies("x", 10).build();
    multiset.addAll(adds);
    assertEquals(1, addCalls.get());
  }

  public void testRemoveUnsupported() {
    Multiset<String> multiset = new NoRemoveMultiset<>();
    multiset.add("a");

    Object readResolve() {
      ImmutableMultiset.Builder<Object> builder =
          new ImmutableMultiset.Builder<Object>(elements.length);
      for (int i = 0; i < elements.length; i++) {
        builder.addCopies(elements[i], counts[i]);
      }
      return builder.build();
    }

    private static final long serialVersionUID = 0;
  }

  @Override
  @J2ktIncompatible // serialization

  private static <T> ImmutableMultiset<T> multiset(Map<T, Integer> counts) {
    ImmutableMultiset.Builder<T> builder = ImmutableMultiset.builder();
    for (Entry<T, Integer> entry : counts.entrySet()) {
      builder.addCopies(entry.getKey(), entry.getValue());
    }
    return builder.build();
  }

  private ListenerCallQueue.Event<Object> countDownEvent(final CountDownLatch latch) {
    return new ListenerCallQueue.Event<Object>() {

  private static <T> ImmutableMultiset<T> multiset(Map<T, Integer> counts) {
    ImmutableMultiset.Builder<T> builder = ImmutableMultiset.builder();
    for (Entry<T, Integer> entry : counts.entrySet()) {
      builder.addCopies(entry.getKey(), entry.getValue());
    }
    return builder.build();
  }

  private ListenerCallQueue.Event<Object> countDownEvent(final CountDownLatch latch) {
    return new ListenerCallQueue.Event<Object>() {

            addCalls.incrementAndGet();
            return super.add(element, occurrences);
          }
        };
    ImmutableMultiset<String> adds =
        new ImmutableMultiset.Builder<String>().addCopies("x", 10).build();
    multiset.addAll(adds);
    assertEquals(1, addCalls.get());
  }

  public void testRemoveUnsupported() {
    Multiset<String> multiset = new NoRemoveMultiset<>();
    multiset.add("a");