Iterable<Integer> mergedIterator = mergeSorted(iterables, Ordering.natural());

    assertEquals(Lists.newLinkedList(expected), Lists.newLinkedList(mergedIterator));
  }

  public void testMergeSorted_stable_allEqual() {
    ImmutableList<Integer> first = ImmutableList.of(0, 2, 4, 6, 8);
    ImmutableList<Integer> second = ImmutableList.of(1, 3, 5, 7, 9);

    Comparator<Object> comparator = Ordering.allEqual();