return this;
    }

    private ImmutableList<Invokable<?, ?>> getFactoriesToTest() {
      ImmutableList.Builder<Invokable<?, ?>> builder = ImmutableList.builder();
      for (Invokable<?, ?> factory : factories) {
        if (returnTypeToTest.isAssignableFrom(factory.getReturnType().getRawType())) {
          builder.add(factory);
        }
      }
      ImmutableList<Invokable<?, ?>> factoriesToTest = builder.build();

    return element.equals(target);
  }

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

  @Override
  public ImmutableList<E> asList() {
    return ImmutableList.of(element);
  }

  @Override
  boolean isPartialView() {
    return false;
  }

  @Override
  int copyIntoArray(@Nullable Object[] dst, int offset) {
    dst[offset] = element;

  }

  public void testCreateEmptyWithClass() {
    Multiset<Color> ms = EnumMultiset.create(ImmutableList.<Color>of(), Color.class);
    ms.add(Color.RED);
  }

  public void testCreateEmptyWithoutClassFails() {
    assertThrows(
        IllegalArgumentException.class, () -> EnumMultiset.create(ImmutableList.<Color>of()));
  }

  public void testToString() {

    generator.addSampleInstances(String.class, ImmutableList.of("a"));
    assertThat(generator.generateFresh(String.class)).isEqualTo("a");
    assertThat(generator.generateFresh(String.class)).isEqualTo("a");
  }

  public void testAddSampleInstances_noInstance() {
    FreshValueGenerator generator = new FreshValueGenerator();
    generator.addSampleInstances(String.class, ImmutableList.<String>of());

    generator.addSampleInstances(String.class, ImmutableList.of("a"));
    assertThat(generator.generateFresh(String.class)).isEqualTo("a");
    assertThat(generator.generateFresh(String.class)).isEqualTo("a");
  }

  public void testAddSampleInstances_noInstance() {
    FreshValueGenerator generator = new FreshValueGenerator();
    generator.addSampleInstances(String.class, ImmutableList.<String>of());

    ImmutableList<TestDatum> first = ImmutableList.of(new TestDatum("A", 1), new TestDatum("A", 2));
    ImmutableList<TestDatum> second =
        ImmutableList.of(new TestDatum("A", 3), new TestDatum("A", 4));

    Comparator<TestDatum> comparator = Comparator.comparing(d -> d.letter);
    Iterator<TestDatum> merged =

  public void testPutAllNullForbidden() {
    assertThrows(NullPointerException.class, () -> multimap().putAll(null, singletonList(v3())));
  }

  @SuppressWarnings("EmptyList") // ImmutableList doesn't support nullable element types
  @MapFeature.Require(SUPPORTS_PUT)
  public void testPutAllEmptyCollectionOnAbsentKey() {
    assertFalse(multimap().putAll(k3(), Collections.emptyList()));
    expectUnchanged();

    ImmutableList<TestDatum> first = ImmutableList.of(new TestDatum("A", 1), new TestDatum("A", 2));
    ImmutableList<TestDatum> second =
        ImmutableList.of(new TestDatum("A", 3), new TestDatum("A", 4));

    Comparator<TestDatum> comparator = Comparator.comparing(d -> d.letter);
    Iterator<TestDatum> merged =

/**
 * An iterator that does not support {@link #remove}.
 *
 * <p>{@code UnmodifiableIterator} is used primarily in conjunction with implementations of {@link
 * ImmutableCollection}, such as {@link ImmutableList}. You can, however, convert an existing
 * iterator to an {@code UnmodifiableIterator} using {@link Iterators#unmodifiableIterator}.
 *
 * @author Jared Levy
 * @since 2.0
 */
@GwtCompatible

   * gets invoked from other immutable collections.
   */
  public void testDoesntCheckForNull() {
    ImmutableSet<Integer> set = ImmutableSet.of(1, 2, 3);
    ImmutableList<Integer> unused =
        new RegularImmutableAsList<Integer>(set, new @Nullable Object[] {null, null, null});
    // shouldn't throw!
  }