T[] result = newArray(array, array.length + 1);
    result[0] = element;
    System.arraycopy(array, 0, result, 1, array.length);
    return result;
  }

  /**
   * Returns a new array that appends {@code element} to {@code array}.
   *
   * @param array the array of elements to prepend
   * @param element the element to append to the end

    assertEquals(String[].class, array.getClass());
    assertThat(array).hasLength(2);
    assertNull(array[0]);
  }

  public void testNewArray_fromArray_OfArray() {
    String[][] array = ObjectArrays.newArray(new String[0][0], 1);
    assertEquals(String[][].class, array.getClass());
    assertThat(array).hasLength(1);
    assertNull(array[0]);
  }

    }
  }

  /** @return an array of the proper size with {@code null} as the key of the middle element. */
  protected Entry<K, V>[] createArrayWithNullKey() {
    Entry<K, V>[] array = createSamplesArray();
    int nullKeyLocation = getNullLocation();
    Entry<K, V> oldEntry = array[nullKeyLocation];
    array[nullKeyLocation] = entry(null, oldEntry.getValue());
    return array;
  }

  protected V getValueForNullKey() {

  public void testNewReferenceArray_withStringArray() throws Exception {
    String[] array = {"foo", "bar", "baz"};
    AtomicReferenceArray<String> refArray = Atomics.newReferenceArray(array);
    for (int i = 0; i < array.length; ++i) {
      assertEquals(array[i], refArray.get(i));
    }
    assertThrows(IndexOutOfBoundsException.class, () -> refArray.get(array.length));
  }

  public void testNewReferenceArray_withNullArray() throws Exception {

  public void testNewReferenceArray_withStringArray() throws Exception {
    String[] array = {"foo", "bar", "baz"};
    AtomicReferenceArray<String> refArray = Atomics.newReferenceArray(array);
    for (int i = 0; i < array.length; ++i) {
      assertEquals(array[i], refArray.get(i));
    }
    assertThrows(IndexOutOfBoundsException.class, () -> refArray.get(array.length));
  }

  public void testNewReferenceArray_withNullArray() throws Exception {

  public void testCreateWithNull_supported() {
    E[] array = createArrayWithNullElement();
    collection = getSubjectGenerator().create(array);
    expectContents(array);
  }

  @CollectionFeature.Require(absent = ALLOWS_NULL_VALUES)
  @CollectionSize.Require(absent = ZERO)
  public void testCreateWithNull_unsupported() {
    E[] array = createArrayWithNullElement();

    try {

    }
  }

  protected E[] createSamplesArray() {
    E[] array = getSubjectGenerator().createArray(getNumElements());
    getSampleElements().toArray(array);
    return array;
  }

  protected E[] createOrderedArray() {
    E[] array = getSubjectGenerator().createArray(getNumElements());
    getOrderedElements().toArray(array);
    return array;
  }

@ElementTypesAreNonnullByDefault
final class RegularImmutableSet<E> extends ImmutableSet<E> {
  private static final Object[] EMPTY_ARRAY = new Object[0];
  static final RegularImmutableSet<Object> EMPTY =
      new RegularImmutableSet<>(EMPTY_ARRAY, 0, EMPTY_ARRAY, 0, 0);

  // The first `size` elements are non-null.
  @VisibleForTesting final transient @Nullable Object[] elements;
  private final transient int hashCode;

    return new Strings();
  }

  @Override
  public Queue<String> create(Object... elements) {
    String[] array = new String[elements.length];
    int i = 0;
    for (Object e : elements) {
      array[i++] = (String) e;
    }
    return create(array);
  }

  protected abstract Queue<String> create(String[] elements);

  @Override
  public String[] createArray(int length) {

    return new Strings();
  }

  @Override
  public List<String> create(Object... elements) {
    String[] array = new String[elements.length];
    int i = 0;
    for (Object e : elements) {
      array[i++] = (String) e;
    }
    return create(array);
  }

  /**
   * Creates a new collection containing the given elements; implement this method instead of {@link
   * #create(Object...)}.