code: def test_lobject_while_async(self):
      # large objects should be prohibited
      self.assertRaises(psycopg2.ProgrammingError, self.conn.lobject)
  
imports: import gc
  import time
  import unittest
  import warnings
  import psycopg2
  import psycopg2.errors
  from psycopg2 import extensions
  from .testutils import ConnectingTestCase, StringIO, skip_before_postgres, skip_if_crdb, crdb_version, slow
label_desc: Use image node_id 14 for calling the AsyncTests obj's underlying member method code with example usage: obj.test_lobject_while_async() without return types