initCollectionWithNullElement();
    assertFalse(collection.spliterator().hasCharacteristics(Spliterator.NONNULL));
  }

  @CollectionFeature.Require(SUPPORTS_ADD)
  public void testSpliteratorNotImmutable_collectionAllowsAdd() {
    // If add is supported, verify that IMMUTABLE is not reported.
    assertFalse(collection.spliterator().hasCharacteristics(Spliterator.IMMUTABLE));
  }

  @CollectionFeature.Require(SUPPORTS_REMOVE)

                    Spliterator.SIZED | Spliterator.DISTINCT | Spliterator.NONNULL,
                    7))
        .expect('a', 'b', 'c', 'd', 'e', 'f', 'g');
  }

  public void testFlatMap_nullStream() {
    SpliteratorTester.of(
            () ->
                CollectSpliterators.flatMap(
                    Arrays.spliterator(new String[] {"abc", "", "de", "f", "g", ""}),

public abstract class ImmutableCollection<E> extends AbstractCollection<E> implements Serializable {
  static final int SPLITERATOR_CHARACTERISTICS =
      Spliterator.IMMUTABLE | Spliterator.NONNULL | Spliterator.ORDERED;

  ImmutableCollection() {}

  @Override
  public abstract UnmodifiableIterator<E> iterator();

  @Override
  public boolean contains(@Nullable Object object) {

      }

      @Override
      public V next() {
        return entryItr.next().getValue();
      }
    };
  }

  @Override
  public Spliterator<V> spliterator() {
    return CollectSpliterators.map(map.entrySet().spliterator(), Entry::getValue);
  }

  @Override
  public boolean contains(@Nullable Object object) {
    return object != null && Iterators.contains(iterator(), object);
  }

  }

  @Override
  public int size() {
    return map.size();
  }

  @Override
  public UnmodifiableIterator<K> iterator() {
    return map.keyIterator();
  }

  @Override
  public Spliterator<K> spliterator() {
    return map.keySpliterator();
  }

  @Override
  public boolean contains(@Nullable Object object) {
    return map.containsKey(object);
  }

  @Override
  K get(int index) {

   *
   * - For stream() and spliterator(), we have to forward to the delegate ourselves because
   *   ForwardingSet does not forward `default` methods, as discussed in its Javadoc.
   */

  @Override
  public Stream<E> stream() {
    return delegate.stream();
  }

  @Override
  public Spliterator<E> spliterator() {
    return delegate.spliterator();
  }

  @Override

    return element;
  }

  @Override
  public UnmodifiableIterator<E> iterator() {
    return singletonIterator(element);
  }

  @Override
  public Spliterator<E> spliterator() {
    return singleton(element).spliterator();
  }

  @Override
  public int size() {
    return 1;
  }

  @Override
  public ImmutableList<E> subList(int fromIndex, int toIndex) {

      }
    };
  }

  Spliterator<V> valuesSpliterator() {
    return CollectSpliterators.map(cellSpliterator(), Table.Cell::getValue);
  }

  @WeakOuter
  private final class Values extends AbstractCollection<V> {
    @Override
    public Iterator<V> iterator() {
      return valuesIterator();
    }

    @Override
    public Spliterator<V> spliterator() {
      return valuesSpliterator();

    return false;
  }

  @Override
  public UnmodifiableIterator<E> iterator() {
    return Iterators.unmodifiableIterator(delegate.iterator());
  }

  @Override
  public Spliterator<E> spliterator() {
    return delegate.spliterator();
  }

  @Override
  public void forEach(Consumer<? super E> action) {
    delegate.forEach(action);
  }

  @Override
  public int size() {
    return delegate.size();

   *   holdsLock assertions.
   *
   * - For stream() and spliterator(), we have to forward to the delegate ourselves because
   *   ForwardingSet does not forward `default` methods, as discussed in its Javadoc.
   */

  // Currently, we don't include stream() and spliterator() for our classes in the Android flavor.

  @Override
  public boolean remove(@Nullable Object o) {