List<String> sequences = Lists.newArrayList("bob", "charlie", "henry", "apple", "lemon");
    assertEquals(3, Iterables.indexOf(sequences, STARTSWITH_A));
  }

  public void testMergeSorted_empty() {
    // Setup
    Iterable<Iterable<Integer>> elements = ImmutableList.of();

    // Test
    Iterable<Integer> iterable = mergeSorted(elements, Ordering.natural());

    // Verify