*
   * <ul>
   *   <li>All non-private static methods are checked such that passing null for any parameter
   *       that's not annotated nullable should throw {@link NullPointerException}.
   *   <li>If there is any non-private constructor or non-private static factory method declared by
   *       {@code cls}, all non-private instance methods will be checked too using the instance

   * stream.
   *
   * <p>A caller can detect EOF if the number of bytes read is less than {@code len}. All subsequent
   * calls on the same stream will return zero.
   *
   * <p>If {@code b} is null, a {@code NullPointerException} is thrown. If {@code off} is negative,
   * or {@code len} is negative, or {@code off+len} is greater than the length of the array {@code

  //             Thread.yield();
  //         }
  //     }

  public static class NPETask implements Callable<String> {
    @Override
    public String call() {
      throw new NullPointerException();
    }
  }

  public static class CallableOne implements Callable<Integer> {
    @Override
    public Integer call() {
      return one;
    }
  }

  }

  public void testConcatNullPointerException() {
    List<Integer> list1 = newArrayList(1);
    List<Integer> list2 = newArrayList(4);

    assertThrows(NullPointerException.class, () -> Iterables.concat(list1, null, list2));
  }

  public void testConcatPeformingFiniteCycle() {
    Iterable<Integer> iterable = asList(1, 2, 3);
    int n = 4;

   * @return {@code ImmutableListMultimap} mapping the result of evaluating the function {@code
   *     keyFunction} on each value in the input collection to that value
   * @throws NullPointerException if any element of {@code values} is {@code null}, or if {@code
   *     keyFunction} produces {@code null} for any key
   */
  public static <K, V> ImmutableListMultimap<K, V> index(

     * change). To access the renamed file it is necessary to construct a
     * new {@code SmbFile}</i>.
     *
     * @param  dest  An <code>SmbFile</code> that represents the new pathname
     * @throws NullPointerException
     *         If the <code>dest</code> argument is <code>null</code>
     * @throws SmbException if an error occurs during the rename operation
     */