code: def test_of_single_col(self):
      User, users = self.classes.User, self.tables.users
      self._assert(
          of=User.id,
          assert_q_of=[users.c.id],
          assert_sel_of=[users.c.id],
      )
  
imports: from sqlalchemy import exc
  from sqlalchemy import testing
  from sqlalchemy.engine import default
  from sqlalchemy.orm import joinedload
  from sqlalchemy.orm import relationship
  from sqlalchemy.testing import assert_raises_message
  from sqlalchemy.testing import AssertsCompiledSQL
  from sqlalchemy.testing import eq_
  from sqlalchemy.testing.fixtures import fixture_session
  from test.orm import _fixtures
label_desc: Use image node_id 7 for calling the ForUpdateTest obj's underlying member method code with example usage: obj.test_of_single_col() without return types