code: def test_subclass_getitem(self, get_dilbert):
      session = fixture_session()
      dilbert = get_dilbert(session)
  
      is_(
          dilbert,
          session.query(Engineer).filter(
              Engineer.engineer_name == "engineer1"
          )[0],
      )
  
imports: from sqlalchemy import exc
  from sqlalchemy import ForeignKey
  from sqlalchemy import Integer
  from sqlalchemy import String
  from sqlalchemy import Table
  from sqlalchemy import testing
  from sqlalchemy.orm import polymorphic_union
  from sqlalchemy.orm import relationship
  from sqlalchemy.orm import Session
  from sqlalchemy.testing import assert_raises
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing import fixtures
  from sqlalchemy.testing import is_
  from sqlalchemy.testing.entities import ComparableEntity
  from sqlalchemy.testing.fixtures import fixture_session
  from sqlalchemy.testing.schema import Column
label_desc: Use image node_id 10 for calling the RoundTripTest obj's underlying member method code with example usage: obj.test_subclass_getitem(get_dilbert) without return types