// lists do.
    assertTrue(iterator.next() instanceof RandomAccess);
    assertTrue(iterator.next() instanceof RandomAccess);
  }

  public void testPaddedPartition_basic() {
    List<Integer> list = asList(1, 2, 3, 4, 5);
    Iterable<List<@Nullable Integer>> partitions = Iterables.paddedPartition(list, 2);
    assertEquals(3, Iterables.size(partitions));