}

  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

import com.google.common.collect.testing.NavigableSetTestSuiteBuilder;
import com.google.common.collect.testing.SampleElements;
import com.google.common.collect.testing.TestSortedMapGenerator;
import com.google.common.collect.testing.TestStringSetGenerator;
import com.google.common.collect.testing.TestStringSortedSetGenerator;
import com.google.common.collect.testing.features.CollectionFeature;