'Verify adding column works with/without headers.'

def test_add_column(self):

    data.append(['kenneth'])
    data.append(['bessie'])
    new_col = ['reitz', 'monke']
    data.append_col(new_col)
    self.assertEqual(data[0], ('kenneth', 'reitz'))
    self.assertEqual(data.width, 2)
    data.headers = ('fname', 'lname')
    new_col = [21, 22]
    data.append_col(new_col, header='age')
    self.assertEqual(data['age'], new_col)
