MapFeature.ALLOWS_NULL_VALUES,
                CollectionFeature.SUPPORTS_ITERATOR_REMOVE,
                MapFeature.GENERAL_PURPOSE)
            .named("SafeTreeMap with natural comparator")
            .createTestSuite());
    suite.addTest(
        NavigableMapTestSuiteBuilder.using(
                new TestStringSortedMapGenerator() {
                  @Override

                MapFeature.ALLOWS_NULL_VALUES,
                CollectionFeature.SUPPORTS_ITERATOR_REMOVE,
                MapFeature.GENERAL_PURPOSE)
            .named("SafeTreeMap with natural comparator")
            .createTestSuite());
    suite.addTest(
        NavigableMapTestSuiteBuilder.using(
                new TestStringSortedMapGenerator() {
                  @Override

 * returned.
 *
 * <p>All default instances returned by {@link #get} are generics-safe. Clients won't get type
 * errors for using {@code get(Comparator.class)} as a {@code Comparator<Foo>}, for example.
 * Immutable empty instances are returned for collection types; {@code ""} for string; {@code 0} for

   * array as the lesser. For example, {@code [] < ['a'] < ['a', 'b'] < ['b']}.
   *
   * <p>The returned comparator is inconsistent with {@link Object#equals(Object)} (since arrays
   * support only identity equality), but it is consistent with {@link Arrays#equals(char[],
   * char[])}.
   *
   * @since 2.0
   */
  public static Comparator<char[]> lexicographicalComparator() {
    return LexicographicalComparator.INSTANCE;
  }

   *
   * <p>The returned comparator is inconsistent with {@link Object#equals(Object)} (since arrays
   * support only identity equality), but it is consistent with {@link Arrays#equals(short[],
   * short[])}.
   *
   * @since 2.0
   */
  public static Comparator<short[]> lexicographicalComparator() {
    return LexicographicalComparator.INSTANCE;
  }

    }

    SortedSet<V> getSortedSetDelegate() {
      return (SortedSet<V>) getDelegate();
    }

    @Override
    public @Nullable Comparator<? super V> comparator() {
      return getSortedSetDelegate().comparator();
    }

    @Override
    @ParametricNullness
    public V first() {
      refreshIfEmpty();
      return getSortedSetDelegate().first();
    }

    Comparator<TestDatum> comparator = Comparator.comparing(d -> d.letter);

    // When elements compare as equal (both C's have same letter), our merge should always return C1
    // before C2, since C1 is from the first iterator.

    Iterator<TestDatum> merged =
        Iterators.mergeSorted(ImmutableList.of(left.iterator(), right.iterator()), comparator);

  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testLexicographicalComparatorSerializable() {
    Comparator<double[]> comparator = Doubles.lexicographicalComparator();
    assertThat(SerializableTester.reserialize(comparator)).isSameInstanceAs(comparator);
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testStringConverterSerialization() {

            new long[] {MAX_VALUE, MAX_VALUE, MAX_VALUE});

    Comparator<long[]> comparator = Longs.lexicographicalComparator();
    Helpers.testComparator(comparator, ordered);
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testLexicographicalComparatorSerializable() {
    Comparator<long[]> comparator = Longs.lexicographicalComparator();

            new short[] {GREATEST, GREATEST, GREATEST});

    Comparator<short[]> comparator = Shorts.lexicographicalComparator();
    Helpers.testComparator(comparator, ordered);
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testLexicographicalComparatorSerializable() {
    Comparator<short[]> comparator = Shorts.lexicographicalComparator();