assertFalse(INSTANCE.containsColumn(1));
  }

  public void testContainsRow() {
    assertFalse(INSTANCE.containsRow('a'));
  }

  public void testContainsValue() {
    assertFalse(INSTANCE.containsValue("blah"));
  }

  public void testRow() {
    assertEquals(ImmutableMap.of(), INSTANCE.row('a'));
  }

  public void testRowKeySet() {
    assertEquals(ImmutableSet.of(), INSTANCE.rowKeySet());
  }

  }

  @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) {

  }

  void setInverse(AbstractBiMap<V, K> inverse) {
    this.inverse = inverse;
  }

  // Query Operations (optimizations)

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

  // Modification Operations

  @CanIgnoreReturnValue
  @Override

    Multimap<String, Integer> multimap = createMultimap();
    assertTrue(multimap.containsKey("foo"));
    assertFalse(multimap.containsKey("cat"));
    assertTrue(multimap.containsValue(1));
    assertFalse(multimap.containsValue(5));
    assertTrue(multimap.containsEntry("foo", 1));
    assertFalse(multimap.containsEntry("cat", 1));
    assertFalse(multimap.containsEntry("foo", 5));

      return obverse.size;
    }

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

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

    @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);
    }

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

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

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

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

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

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

    }

    /**
     * @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 {

        if (artifacts != null && !artifacts.isEmpty()) {
            boolean v4api = foreignImports != null && foreignImports.containsValue(maven4ApiRealm);
            for (Artifact artifact : artifacts) {
                if (!isProvidedArtifact(artifact, v4api) && artifact.getFile() != null) {