return Iterators.paddedPartition(source, 3);
      }
    }.test();
  }

  public void testPaddedPartition_view() {
    List<Integer> list = asList(1, 2);
    Iterator<List<Integer>> partitions = Iterators.paddedPartition(list.iterator(), 1);

    // Changes before the PaddedPartition is retrieved are reflected
    list.set(0, 3);

        return Iterators.paddedPartition(source, 3);
      }
    }.test();
  }

  public void testPaddedPartition_view() {
    List<Integer> list = asList(1, 2);
    Iterator<List<Integer>> partitions = Iterators.paddedPartition(list.iterator(), 1);

    // Changes before the PaddedPartition is retrieved are reflected
    list.set(0, 3);

    Iterable<List<@Nullable Integer>> partitions = Iterables.paddedPartition(list, 2);
    assertEquals(3, Iterables.size(partitions));
    assertEquals(Arrays.<@Nullable Integer>asList(5, null), Iterables.getLast(partitions));
  }

  public void testPaddedPartitionRandomAccessInput() {
    Iterable<Integer> source = asList(1, 2, 3);
    Iterable<List<Integer>> partitions = Iterables.paddedPartition(source, 2);

   * @throws IllegalArgumentException if {@code size} is nonpositive
   */
  public static <T extends @Nullable Object>
      UnmodifiableIterator<List<@Nullable T>> paddedPartition(Iterator<T> iterator, int size) {
    return partitionImpl(iterator, size, true);
  }

  private static <T extends @Nullable Object> UnmodifiableIterator<List<@Nullable T>> partitionImpl(