assertFalse(partitions.hasNext());
  }

  public void testPartition_singleton2() {
    Iterator<Integer> source = singletonIterator(1);
    Iterator<List<Integer>> partitions = Iterators.partition(source, 2);
    assertTrue(partitions.hasNext());
    assertTrue(partitions.hasNext());
    assertEquals(ImmutableList.of(1), partitions.next());
    assertFalse(partitions.hasNext());
  }

    Iterable<Integer> source = emptySet();
    Iterable<List<Integer>> partitions = Iterables.partition(source, 1);
    assertTrue(Iterables.isEmpty(partitions));
  }

  public void testPartition_singleton1() {
    Iterable<Integer> source = singleton(1);
    Iterable<List<Integer>> partitions = Iterables.partition(source, 1);
    assertEquals(1, Iterables.size(partitions));