code: def _fixture(self):
      Base = declarative_base()
  
      class Foo(Base):
          __tablename__ = "foo"
          id = Column(Integer, primary_key=True)
  
      return Foo
  
imports: from sqlalchemy import Column
  from sqlalchemy import func
  from sqlalchemy import Integer
  from sqlalchemy import String
  from sqlalchemy.orm import aliased
  from sqlalchemy.orm import declarative_base
  from sqlalchemy.orm import descriptor_props
  from sqlalchemy.orm.interfaces import PropComparator
  from sqlalchemy.orm.properties import ColumnProperty
  from sqlalchemy.sql import column
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing import fixtures
  from sqlalchemy.util import partial
label_desc: Use image node_id 1 for calling the DescriptorInstrumentationTest obj's underlying member method code with example usage: obj._fixture() and returns: Foo