*
 * @author Hayward Chan
 * @author Louis Wasserman
 */
@NullUnmarked
public class ForwardingMapTest extends TestCase {
  static class StandardImplForwardingMap<K, V> extends ForwardingMap<K, V> {
    private final Map<K, V> backingMap;

    StandardImplForwardingMap(Map<K, V> backingMap) {
      this.backingMap = backingMap;
    }

    @Override
    protected Map<K, V> delegate() {
      return backingMap;
    }

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