code: def test_connection(self):
      self.assertTrue(hasattr(lore.io, "main"))
  
imports: from __future__ import unicode_literals
  import unittest
  from threading import Thread
  import datetime
  import time
  import math
  import lore.io.connection
  import sqlalchemy
  from sqlalchemy import event
  from sqlalchemy.engine import Engine
  import pandas
  import lore
label_desc: Use image node_id 3 for calling the TestConnection obj's underlying member method code with example usage: obj.test_connection() without return types