assertFalse(set.containsAll(Sets.newTreeSet(asList("f", "d", "a"))));
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testDifferentComparator_serialization() {
    // don't use Collections.reverseOrder(); it didn't reserialize to the same instance in JDK5
    Comparator<Comparable<?>> comparator = Ordering.natural().reverse();
    SortedSet<String> set =