code: def setup_mappers(cls):
      Address, addresses, users, User = (
          cls.classes.Address,
          cls.tables.addresses,
          cls.tables.users,
          cls.classes.User,
      )
  
      cls.mapper_registry.map_imperatively(Address, addresses)
      cls.mapper_registry.map_imperatively(
          User,
          users,
          properties={
              "address": relationship(
                  Address,
                  backref=backref("user"),
                  uselist=False,
                  _legacy_inactive_history_style=(
                      cls._legacy_inactive_history_style
                  ),
              )
          },
      )
  
imports: from sqlalchemy import testing
  from sqlalchemy import text
  from sqlalchemy.orm import attributes
  from sqlalchemy.orm import backref
  from sqlalchemy.orm import relationship
  from sqlalchemy.orm import Session
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing import is_
  from sqlalchemy.testing.fixtures import fixture_session
  from test.orm import _fixtures
label_desc: Use image node_id 1 for calling the O2OScalarBackrefMoveTest obj's underlying member method code with example usage: obj.setup_mappers(cls) without return types