code: def test_row_names(self):
      table = Table(
          self.rows,
          self.column_names,
          self.column_types,
          row_names="three",
      )
      column = table.columns["one"]
  
      self.assertSequenceEqual(column._keys, ["a", "b", "c"])
      self.assertEqual(column["b"], 2)
  
imports: import pickle
  import unittest
  from decimal import Decimal
  from agate import Table
  from agate.data_types import Number, Text
label_desc: Use image node_id 6 for calling the TestColumn obj's underlying member method code with example usage: obj.test_row_names() without return types