return TreeMultimap.create(StringLength.COMPARATOR, DECREASING_INT_COMPARATOR);
  }

  /** Create and populate a {@code TreeMultimap} with explicit comparators. */
  private TreeMultimap<@Nullable String, @Nullable Integer> createPopulate() {
    TreeMultimap<@Nullable String, @Nullable Integer> multimap =
        TreeMultimap.create(StringLength.COMPARATOR, DECREASING_INT_COMPARATOR);
    multimap.put("google", 2);

    SortedSet<String> set =
        ImmutableSortedSet.copyOf(
            STRING_LENGTH, asList("in", "the", "quick", "jumped", "over", "a"));
    assertSame(STRING_LENGTH, set.comparator());
  }

  public void testCopyOfExplicit_iterator_ordering() {
    SortedSet<String> set =
        ImmutableSortedSet.copyOf(
            STRING_LENGTH, asIterator("in", "the", "quick", "jumped", "over", "a"));