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() {

  }

  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()) {

  public boolean contains(@CheckForNull Object rowKey, @CheckForNull Object columnKey) {
    return delegate().contains(rowKey, columnKey);
  }

  @Override
  public boolean containsColumn(@CheckForNull Object columnKey) {
    return delegate().containsColumn(columnKey);
  }

  @Override
  public boolean containsRow(@CheckForNull Object rowKey) {
    return delegate().containsRow(rowKey);
  }

  @Override

      // requireNonNull is safe because of the containsColumn check.
      return containsColumn(key) ? column((C) requireNonNull(key)) : null;
    }

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

    @Override
    @CheckForNull
    public Map<R, V> remove(@CheckForNull Object key) {
      return containsColumn(key) ? removeColumn(key) : null;
    }

  }

  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() {
    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');

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

  @Override
  public void testContainsValue() {

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

  @Override
  public void testContainsValue() {

    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() {

  public boolean contains(@CheckForNull Object rowKey, @CheckForNull Object columnKey) {
    return delegate().contains(rowKey, columnKey);
  }

  @Override
  public boolean containsColumn(@CheckForNull Object columnKey) {
    return delegate().containsColumn(columnKey);
  }

  @Override
  public boolean containsRow(@CheckForNull Object rowKey) {
    return delegate().containsRow(rowKey);
  }

  @Override