protected SortedSet<String> create(String[] elements) {
      return ImmutableSortedSet.<String>reverseOrder().add(elements).build().descendingSet();
    }
  }

  public static class ImmutableSortedSetExplicitComparator extends TestStringSetGenerator {

    private static final Comparator<String> STRING_REVERSED = Collections.reverseOrder();

    @Override
    protected SortedSet<String> create(String[] elements) {

    protected SortedSet<String> create(String[] elements) {
      return ImmutableSortedSet.<String>reverseOrder().add(elements).build().descendingSet();
    }
  }

  public static class ImmutableSortedSetExplicitComparator extends TestStringSetGenerator {

    private static final Comparator<String> STRING_REVERSED = Collections.reverseOrder();

    @Override
    protected SortedSet<String> create(String[] elements) {

            .createTestSuite());

    suite.addTest(
        NavigableSetTestSuiteBuilder.using(new ImmutableSortedSetReversedOrderGenerator())
            .named(ImmutableSortedSetTest.class.getName() + ", reverseOrder, iterator")
            .withFeatures(
                CollectionSize.ANY,
                CollectionFeature.KNOWN_ORDER,
                CollectionFeature.SERIALIZABLE,

            .createTestSuite());

    suite.addTest(
        NavigableSetTestSuiteBuilder.using(new ImmutableSortedSetReversedOrderGenerator())
            .named(ImmutableSortedSetTest.class.getName() + ", reverseOrder, iterator")
            .withFeatures(
                CollectionSize.ANY,
                CollectionFeature.KNOWN_ORDER,
                CollectionFeature.SERIALIZABLE,

    assertFalse(copy.containsKey(twelve));
  }

  public void testBuilderReverseOrder() {
    ImmutableSortedMap<String, Integer> map =
        ImmutableSortedMap.<String, Integer>reverseOrder()
            .put("one", 1)
            .put("two", 2)
            .put("three", 3)
            .put("four", 4)
            .put("five", 5)
            .build();

  }

  public void testReverse() {
    Ordering<Number> reverseOrder = numberOrdering.reverse();
    testComparator(reverseOrder, Integer.MAX_VALUE, 1, 0, -1, Integer.MIN_VALUE);

    new EqualsTester()
        .addEqualityGroup(reverseOrder, numberOrdering.reverse())
        .addEqualityGroup(Ordering.natural().reverse())
        .addEqualityGroup(Collections.reverseOrder())
        .testEquals();
  }

  }

  public void testReverse() {
    Ordering<Number> reverseOrder = numberOrdering.reverse();
    testComparator(reverseOrder, Integer.MAX_VALUE, 1, 0, -1, Integer.MIN_VALUE);

    new EqualsTester()
        .addEqualityGroup(reverseOrder, numberOrdering.reverse())
        .addEqualityGroup(Ordering.natural().reverse())
        .addEqualityGroup(Collections.reverseOrder())
        .testEquals();
  }

@GwtCompatible
@NullMarked
@SuppressWarnings("JUnitIncompatibleType") // Many intentional violations here.
public class MapsTest extends TestCase {

  private static final Comparator<Integer> SOME_COMPARATOR = Collections.reverseOrder();

  public void testHashMap() {
    @SuppressWarnings("UseCollectionConstructor") // test of factory method
    HashMap<Integer, Integer> map = Maps.newHashMap();
    assertEquals(emptyMap(), map);
  }

    return tailSet(fromElement);
  }

  public static <E> Builder<E> orderedBy(Comparator<E> comparator) {
    return new Builder<E>(comparator);
  }

  public static <E extends Comparable<?>> Builder<E> reverseOrder() {
    return new Builder<E>(Ordering.natural().reverse());
  }

  public static <E extends Comparable<?>> Builder<E> naturalOrder() {
    return new Builder<E>(Ordering.natural());
  }

  }

  public static <K, V> Builder<K, V> orderedBy(Comparator<K> comparator) {
    return new Builder<K, V>(comparator);
  }

  public static <K extends Comparable<?>, V> Builder<K, V> reverseOrder() {
    return new Builder<K, V>(Ordering.natural().reverse());
  }

  public static final class Builder<K, V> extends ImmutableMap.Builder<K, V> {
    private final Comparator<? super K> comparator;