code: def test_6_get_columns(self):
      result = self.handler.get_columns("PREM")
      assert result.type is not RESPONSE_TYPE.ERROR
  
file_path: mindsdb/mindsdb/integrations/handlers/d0lt_handler/tests/test_d0lt_handler.py
imports: import unittest
  from mindsdb.integrations.handlers.d0lt_handler.d0lt_handler import D0ltHandler
  from mindsdb.api.executor.data_types.response_type import RESPONSE_TYPE
label_desc: Use image node_id 8 for calling the D0ltHandlerTest obj's underlying member method code with example usage: obj.test_6_get_columns() without return types