code: def _company_with_emps_fixture(self):
      return [
          Company(
              name="MegaCorp, Inc.",
              employees=[
                  Engineer(
                      name="dilbert",
                      engineer_name="dilbert",
                      primary_language="java",
                      status="regular engineer",
                  ),
                  Engineer(
                      name="wally",
                      engineer_name="wally",
                      primary_language="c++",
                      status="regular engineer",
                  ),
                  Boss(
                      name="pointy haired boss",
                      golf_swing="fore",
                      manager_name="pointy",
                      status="da boss",
                  ),
                  Manager(
                      name="dogbert",
                      manager_name="dogbert",
                      status="regular manager",
                  ),
              ],
          ),
          Company(
              name="Elbonia, Inc.",
              employees=[
                  Engineer(
                      name="vlad",
                      engineer_name="vlad",
                      primary_language="cobol",
                      status="elbonian engineer",
                  )
              ],
          ),
      ]
  
imports: from sqlalchemy import ForeignKey
  from sqlalchemy import Integer
  from sqlalchemy import String
  from sqlalchemy import util
  from sqlalchemy.orm import polymorphic_union
  from sqlalchemy.orm import relationship
  from sqlalchemy.orm import sessionmaker
  from sqlalchemy.sql.selectable import LABEL_STYLE_TABLENAME_PLUS_COL
  from sqlalchemy.testing import AssertsCompiledSQL
  from sqlalchemy.testing import config
  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 5 for calling the _PolymorphicFixtureBase obj's underlying member method code with example usage: obj._company_with_emps_fixture() and returns: list