}

  public void testContainsColumn() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    assertTrue(table.containsColumn(1));
    assertTrue(table.containsColumn(3));
    assertFalse(table.containsColumn(2));
    assertFalse(table.containsColumn(null));
  }

  public void testContainsValue() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');

  }

  public void testContainsColumn() {
    for (ImmutableTable<Character, Integer, String> testInstance : getTestInstances()) {
      assertTrue(testInstance.containsColumn(1));
      assertTrue(testInstance.containsColumn(2));
      assertFalse(testInstance.containsColumn(3));
    }
  }

  public void testContainsRow() {
    for (ImmutableTable<Character, Integer, String> testInstance : getTestInstances()) {

    assertFalse(testTable.contains('A', 1));
    assertFalse(testTable.contains('A', 2));
  }

  public void testContainsColumn() {
    assertTrue(testTable.containsColumn(1));
    assertFalse(testTable.containsColumn(2));
  }

  public void testContainsRow() {
    assertTrue(testTable.containsRow('a'));
    assertFalse(testTable.containsRow('A'));
  }

  public void testContainsValue() {

      assertTrue(Thread.holdsLock(mutex));
      return delegate.contains(rowKey, columnKey);
    }

    @Override
    public boolean containsColumn(Object columnKey) {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.containsColumn(columnKey);
    }

    @Override
    public boolean containsRow(Object rowKey) {
      assertTrue(Thread.holdsLock(mutex));

    this(cell.getRowKey(), cell.getColumnKey(), cell.getValue());
  }

  @Override
  public ImmutableMap<R, V> column(C columnKey) {
    checkNotNull(columnKey);
    return containsColumn(columnKey)
        ? ImmutableMap.of(singleRowKey, singleValue)
        : ImmutableMap.<R, V>of();
  }

  @Override
  public ImmutableMap<C, Map<R, V>> columnMap() {

    implements Table<R, C, V> {

  @Override
  public boolean containsRow(@Nullable Object rowKey) {
    return Maps.safeContainsKey(rowMap(), rowKey);
  }

  @Override
  public boolean containsColumn(@Nullable Object columnKey) {
    return Maps.safeContainsKey(columnMap(), columnKey);
  }

  @Override
  public Set<R> rowKeySet() {
    return rowMap().keySet();
  }

  @Override

    implements Table<R, C, V> {

  @Override
  public boolean containsRow(@Nullable Object rowKey) {
    return Maps.safeContainsKey(rowMap(), rowKey);
  }

  @Override
  public boolean containsColumn(@Nullable Object columnKey) {
    return Maps.safeContainsKey(columnMap(), columnKey);
  }

  @Override
  public Set<R> rowKeySet() {
    return rowMap().keySet();
  }

  @Override