code: def test_data_type(self):
      self.assertIs(
          self.table.columns["one"].data_type, self.number_type
      )
  
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 4 for calling the TestColumn obj's underlying member method code with example usage: obj.test_data_type() without return types