assertTrue(elementsEqual(set, copy));
    assertEquals(set.comparator(), copy.comparator());
  }

  /* "Explicit" indicates an explicit comparator. */

  public void testExplicit_ordering() {
    SortedSet<String> set =
        ImmutableSortedSet.orderedBy(STRING_LENGTH)
            .add("in", "the", "quick", "jumped", "over", "a")
            .build();