assertThat(natural).isNotNull();
    ImmutableSortedSet.Builder<SuperComparableExample> reverse = ImmutableSortedSet.reverseOrder();
    assertThat(reverse).isNotNull();
  }

  public void testBuilderAsymptotics() {
    int[] compares = {0};
    Comparator<Integer> countingComparator =
        (i, j) -> {
          compares[0]++;
          return i.compareTo(j);
        };