code: def setup_mappers(cls):
      global Session
      Session = scoped_session(sessionmaker(testing.db))
      cls.mapper_registry.map_imperatively(
          User,
          users,
          properties={
              "addresses": relationship(
                  Address, backref="user", order_by=addresses.c.id
              )
          },
      )
      cls.mapper_registry.map_imperatively(Address, addresses)
      configure_mappers()
  
imports: from sqlalchemy import desc
  from sqlalchemy import ForeignKey
  from sqlalchemy import func
  from sqlalchemy import Integer
  from sqlalchemy import join
  from sqlalchemy import literal_column
  from sqlalchemy import MetaData
  from sqlalchemy import select
  from sqlalchemy import String
  from sqlalchemy import testing
  from sqlalchemy.ext import serializer
  from sqlalchemy.orm import aliased
  from sqlalchemy.orm import class_mapper
  from sqlalchemy.orm import column_property
  from sqlalchemy.orm import configure_mappers
  from sqlalchemy.orm import joinedload
  from sqlalchemy.orm import relationship
  from sqlalchemy.orm import scoped_session
  from sqlalchemy.orm import sessionmaker
  from sqlalchemy.testing import AssertsCompiledSQL
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing import fixtures
  from sqlalchemy.testing.entities import ComparableEntity
  from sqlalchemy.testing.schema import Column
  from sqlalchemy.testing.schema import Table
label_desc: Use image node_id 2 for calling the SerializeTest obj's underlying member method code with example usage: obj.setup_mappers(cls) without return types