synchronized (mutex) {
        return delegate().containsKey(key);
      }
    }

    @Override
    public boolean containsValue(@CheckForNull Object value) {
      synchronized (mutex) {
        return delegate().containsValue(value);
      }
    }

    @Override
    public boolean containsEntry(@CheckForNull Object key, @CheckForNull Object value) {
      synchronized (mutex) {

      synchronized (mutex) {
        return delegate().containsKey(key);
      }
    }

    @Override
    public boolean containsValue(@CheckForNull Object value) {
      synchronized (mutex) {
        return delegate().containsValue(value);
      }
    }

    @Override
    public boolean containsEntry(@CheckForNull Object key, @CheckForNull Object value) {
      synchronized (mutex) {

        postReadCleanup();
      }
    }

    /**
     * This method is a convenience for testing. Code should call {@link
     * MapMakerInternalMap#containsValue} directly.
     */
    @VisibleForTesting
    boolean containsValue(Object value) {
      try {
        if (count != 0) { // read-volatile
          AtomicReferenceArray<E> table = this.table;
          int length = table.length();

        postReadCleanup();
      }
    }

    /**
     * This method is a convenience for testing. Code should call {@link
     * MapMakerInternalMap#containsValue} directly.
     */
    @VisibleForTesting
    boolean containsValue(Object value) {
      try {
        if (count != 0) { // read-volatile
          AtomicReferenceArray<E> table = this.table;
          int length = table.length();

    }

    @Override
    public boolean containsKey(@CheckForNull Object key) {
      return map.containsKey(key);
    }

    @Override
    public boolean containsValue(@CheckForNull Object value) {
      return map.containsValue(value);
    }

    @Override
    public boolean containsEntry(@CheckForNull Object key, @CheckForNull Object value) {

    for (Object key : lookupKeys) {
      assertTrue(cache.asMap().containsKey(key));
    }
    assertSame(extraValue, cache.asMap().get(extraKey));
    assertFalse(cache.asMap().containsValue(extraKey));
  }

  public void testBulkLoad_partial() throws ExecutionException {
    final Object extraKey = new Object();
    final Object extraValue = new Object();
    CacheLoader<Object, Object> loader =