public boolean isEmpty() {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.isEmpty();
    }

    @Override
    public boolean containsValue(@Nullable Object value) {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.containsValue(value);
    }

    @Override
    public void clear() {
      assertTrue(Thread.holdsLock(mutex));
      delegate.clear();
    }

    @Override

      return delegate.containsKey(checkValid(key));
    } catch (NullPointerException | ClassCastException e) {
      return false;
    }
  }

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

  @Override
  public NavigableSet<K> descendingKeySet() {
    return delegate.descendingKeySet();
  }

  @Override

    cache.put(2456, 56);
    cache.put(2, 15);

    fakeTicker.advance(10001, MILLISECONDS);

    assertTrue(cache.asMap().containsValue(15));
    assertTrue(cache.asMap().containsValue(56));
    assertFalse(cache.asMap().containsValue(2675));
  }

  public void testAsMap_containsKey() {
    Cache<Integer, Integer> cache =

          "Inverse should not contain key " + reversed.getKey(),
          inv.containsKey(reversed.getKey()));
      assertFalse(
          "Inverse should not contain value " + reversed.getValue(),
          inv.containsValue(reversed.getValue()));
      /*
       * TODO(cpovirk): This is a bit stronger than super.expectMissing(), which permits a <key,
       * someOtherValue> pair.
       */
      assertNull(

    checkNotNull(action).accept(singleKey, singleValue);
  }

  @Override
  public boolean containsKey(@Nullable Object key) {
    return singleKey.equals(key);
  }

  @Override
  public boolean containsValue(@Nullable Object value) {
    return singleValue.equals(value);
  }

  @Override
  boolean isPartialView() {
    return false;
  }

  @Override
  ImmutableSet<Entry<K, V>> createEntrySet() {

    }
  }

  protected void expectMissingValues(V... elements) {
    for (V element : elements) {
      assertFalse("Should not contain value " + element, getMap().containsValue(element));
    }
  }

  /**
   * @return an array of the proper size with {@code null} as the key of the middle element.
   */
  protected Entry<K, V>[] createArrayWithNullKey() {

    }

    @Override
    public boolean containsKey(@Nullable Object key) {
      return forward.containsValue(key);
    }

    @Override
    public @Nullable K get(@Nullable Object key) {
      return forward.getInverse(key);
    }

    @Override
    public boolean containsValue(@Nullable Object value) {
      return forward.containsKey(value);
    }

    @Override

    }

    @Override
    public boolean containsRow(@Nullable Object rowKey) {
      return original.containsColumn(rowKey);
    }

    @Override
    public boolean containsValue(@Nullable Object value) {
      return original.containsValue(value);
    }

    @Override
    public @Nullable V get(@Nullable Object rowKey, @Nullable Object columnKey) {
      return original.get(columnKey, rowKey);
    }

  }

  @Override
  public Iterator<V> iterator() {
    return Maps.valueIterator(multimap.entries().iterator());
  }

  @Override
  public boolean contains(@Nullable Object o) {
    return multimap.containsValue(o);
  }

  @Override
  public int size() {
    return multimap.size();
  }

  @Override
  public boolean remove(@Nullable Object o) {

    }

    /**
     * @throws Exception
     */
    @Test
    public void testContainsValue() throws Exception {
        assertThat(map.containsValue("test2"), is(true));
        assertThat(map.containsValue("test3"), is(not(true)));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testContainsKey() throws Exception {