Iterables.addAll(deque, elements);
    return deque;
  }

  // LinkedBlockingQueue

  /** Creates an empty {@code LinkedBlockingQueue} with a capacity of {@link Integer#MAX_VALUE}. */
  @J2ktIncompatible
  @GwtIncompatible // LinkedBlockingQueue
  public static <E> LinkedBlockingQueue<E> newLinkedBlockingQueue() {
    return new LinkedBlockingQueue<>();
  }

  /**

   */

  public static List<BlockingQueue<Object>> blockingQueues() {
    return ImmutableList.<BlockingQueue<Object>>of(
        new LinkedBlockingQueue<Object>(),
        new LinkedBlockingQueue<Object>(10),
        new SynchronousQueue<Object>(),
        new ArrayBlockingQueue<Object>(10),
        new LinkedBlockingDeque<Object>(),
        new LinkedBlockingDeque<Object>(10),

   */

  public static List<BlockingQueue<Object>> blockingQueues() {
    return ImmutableList.<BlockingQueue<Object>>of(
        new LinkedBlockingQueue<Object>(),
        new LinkedBlockingQueue<Object>(10),
        new SynchronousQueue<Object>(),
        new ArrayBlockingQueue<Object>(10),
        new LinkedBlockingDeque<Object>(),
        new LinkedBlockingDeque<Object>(10),