code: def setup_mappers(cls):
      addresses, Order, User, Address, orders, users = (
          cls.tables.addresses,
          cls.classes.Order,
          cls.classes.User,
          cls.classes.Address,
          cls.tables.orders,
          cls.tables.users,
      )
  
      cls.mapper_registry.map_imperatively(
          User,
          users,
          properties={
              "orders": relationship(
                  cls.mapper_registry.map_imperatively(
                      Order,
                      orders,
                      properties={
                          "addresses": relationship(
                              cls.mapper_registry.map_imperatively(
                                  Address, addresses
                              )
                          )
                      },
                  )
              )
          },
      )
  
imports: import sqlalchemy
  from sqlalchemy import ForeignKey
  from sqlalchemy import func
  from sqlalchemy import Integer
  from sqlalchemy import testing
  from sqlalchemy.orm import relationship
  from sqlalchemy.testing import config
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing import fixtures
  from sqlalchemy.testing.fixtures import fixture_session
  from sqlalchemy.testing.provision import normalize_sequence
  from sqlalchemy.testing.schema import Column
  from sqlalchemy.testing.schema import Table
  from test.orm import _fixtures
label_desc: Use image node_id 1 for calling the RelationshipsTest obj's underlying member method code with example usage: obj.setup_mappers(cls) without return types