}

  NavigableMapTestSuiteBuilder<K, V> subSuiteUsing(TestSortedMapGenerator<K, V> generator) {
    return using(generator);
  }

  private static final class DescendingTestMapGenerator<K, V>
      extends ForwardingTestMapGenerator<K, V> implements TestSortedMapGenerator<K, V> {
    DescendingTestMapGenerator(TestSortedMapGenerator<K, V> delegate) {
      super(delegate);
    }

    @Override

          OneSizeTestContainerGenerator<Map<K, V>, Entry<K, V>> mapGenerator) {
    TestContainerGenerator<Map<K, V>, Entry<K, V>> generator = mapGenerator.getInnerGenerator();
    if (generator instanceof TestSortedMapGenerator
        && ((TestSortedMapGenerator<K, V>) generator).create().keySet() instanceof SortedSet) {
      return new MapSortedKeySetGenerator<>(mapGenerator);
    } else {
      return new MapKeySetGenerator<>(mapGenerator);
    }
  }

  }

  NavigableMapTestSuiteBuilder<K, V> subSuiteUsing(TestSortedMapGenerator<K, V> generator) {
    return using(generator);
  }

  private static final class DescendingTestMapGenerator<K, V>
      extends ForwardingTestMapGenerator<K, V> implements TestSortedMapGenerator<K, V> {
    DescendingTestMapGenerator(TestSortedMapGenerator<K, V> delegate) {
      super(delegate);
    }

    @Override