protected Queue<String> create() {
    TestQueue<String> inner = new TestQueue<>();
    Queue<String> outer = Synchronized.queue(inner, null);
    inner.mutex = outer;
    outer.add("foo"); // necessary because we try to remove elements later on
    return outer;
  }

  private static final class TestQueue<E> implements Queue<E> {
    private final Queue<E> delegate = Lists.newLinkedList();

  }

  public void testConverter_nullConversions() {
    for (CaseFormat outer : CaseFormat.values()) {
      for (CaseFormat inner : CaseFormat.values()) {
        assertNull(outer.converterTo(inner).convert(null));
        assertNull(outer.converterTo(inner).reverse().convert(null));
      }
    }
  }

  public void testConverter_toString() {
    assertEquals(

                    SetMultimap<String, String> outer =
                        Synchronized.setMultimap(inner, inner.mutex);
                    for (Entry<String, String> entry : entries) {
                      outer.put(entry.getKey(), entry.getValue());
                    }
                    return outer;
                  }
                })
            .named("Synchronized.setMultimap")

  }

  public void testConverter_nullConversions() {
    for (CaseFormat outer : CaseFormat.values()) {
      for (CaseFormat inner : CaseFormat.values()) {
        assertNull(outer.converterTo(inner).convert(null));
        assertNull(outer.converterTo(inner).reverse().convert(null));
      }
    }
  }

  public void testConverter_toString() {
    assertEquals(

                TestSet<String> inner = new TestSet<>(new HashSet<String>(), null);
                Set<String> outer = Synchronized.set(inner, null);
                inner.mutex = outer;
                Collections.addAll(outer, elements);
                return outer;
              }
            })
        .named("Synchronized.set")
        .withFeatures(
            CollectionFeature.GENERAL_PURPOSE,

FIELD java.util.AbstractMap.values com.google.common.collect.TreeRangeMap.SubRangeMap.SubRangeMapAsMap.values.$
OUTER com.google.common.collect.StandardTable.Row

public class SynchronizedDequeTest extends TestCase {

  protected Deque<String> create() {
    TestDeque<String> inner = new TestDeque<>();
    Deque<String> outer = Synchronized.deque(inner, inner.mutex);
    outer.add("foo"); // necessary because we try to remove elements later on
    return outer;
  }

  private static final class TestDeque<E> implements Deque<E> {
    private final Deque<E> delegate = Lists.newLinkedList();

public class SynchronizedQueueTest extends TestCase {

  protected Queue<String> create() {
    TestQueue<String> inner = new TestQueue<>();
    Queue<String> outer = Synchronized.queue(inner, inner.mutex);
    outer.add("foo"); // necessary because we try to remove elements later on
    return outer;
  }

  private static final class TestQueue<E> implements Queue<E> {
    private final Queue<E> delegate = Lists.newLinkedList();

                TestSet<String> inner = new TestSet<>(new HashSet<String>(), MUTEX);
                Set<String> outer = Synchronized.set(inner, inner.mutex);
                Collections.addAll(outer, elements);
                return outer;
              }
            })
        .named("Synchronized.set")
        .withFeatures(
            CollectionFeature.GENERAL_PURPOSE,

  public final Object mutex = new Integer(1); // something Serializable

  protected <K, V> Map<K, V> create() {
    TestMap<K, V> inner = new TestMap<>(new HashMap<K, V>(), mutex);
    Map<K, V> outer = Synchronized.map(inner, mutex);
    return outer;
  }

  static class TestMap<K, V> extends ForwardingMap<K, V> implements Serializable {
    public final Object mutex;
    private Map<K, V> delegate;