code: def setUpClass(self):
      self.table = sqlalchemy.Table(
          "tests_users",
          lore.io.main.metadata,
          sqlalchemy.Column("id", sqlalchemy.Integer, primary_key=True),
          sqlalchemy.Column(
              "first_name", sqlalchemy.String(50), nullable=False
          ),
          sqlalchemy.Column(
              "last_name", sqlalchemy.String(50), nullable=False
          ),
          sqlalchemy.Column(
              "nullable", sqlalchemy.Float(), nullable=True
          ),
          sqlalchemy.Column(
              "zero", sqlalchemy.Integer(), nullable=False
          ),
          sqlalchemy.Column("pi", sqlalchemy.Float(), nullable=False),
          sqlalchemy.Index(
              "index_tests_users_first_name_last_name",
              "first_name",
              "last_name",
              unique=True,
          ),
          sqlalchemy.Index(
              "long_name_long_name_long_name_long_name_long_name_long_name_63_",
              "first_name",
              unique=True,
          ),
      )
      lore.io.main.metadata.create_all()
  
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 1 for calling the TestConnection obj's underlying member method code with example usage: obj.setUpClass() without return types