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));