*
 * @author Robert KonigsbergSortedMapFeature
 */
@NullUnmarked
public class ForwardingSortedMapTest extends TestCase {
  static class StandardImplForwardingSortedMap<K, V> extends ForwardingSortedMap<K, V> {
    private final SortedMap<K, V> backingSortedMap;

    StandardImplForwardingSortedMap(SortedMap<K, V> backingSortedMap) {
      this.backingSortedMap = backingSortedMap;
    }

    @Override