* the {@code ForwardingConcurrentMap}.
 *
 * @author Charles Fry
 * @since 2.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class ForwardingConcurrentMap<K, V> extends ForwardingMap<K, V>
    implements ConcurrentMap<K, V> {

  /** Constructor for use by subclasses. */
  protected ForwardingConcurrentMap() {}

  @Override

 * the {@code ForwardingConcurrentMap}.
 *
 * @author Charles Fry
 * @since 2.0
 */
@GwtCompatible
@ElementTypesAreNonnullByDefault
public abstract class ForwardingConcurrentMap<K, V> extends ForwardingMap<K, V>
    implements ConcurrentMap<K, V> {

  /** Constructor for use by subclasses. */
  protected ForwardingConcurrentMap() {}

  @Override

import java.util.concurrent.ConcurrentMap;
import junit.framework.TestCase;

/**
 * Tests for {@link ForwardingConcurrentMap}.
 *
 * @author Jared Levy
 */
public class ForwardingConcurrentMapTest extends TestCase {

  private static class TestMap extends ForwardingConcurrentMap<String, Integer> {
    final ConcurrentMap<String, Integer> delegate = new ConcurrentHashMap<>();

    @Override