code: def test_notify(self):
      cur = self.conn.cursor()
      sync_cur = self.sync_conn.cursor()
  
      sync_cur.execute("listen test_notify")
      self.sync_conn.commit()
      cur.execute("notify test_notify")
      self.wait(cur)
  
      self.assertEquals(self.sync_conn.notifies, [])
  
      pid = self.conn.info.backend_pid
      for _ in range(5):
          self.wait(self.sync_conn)
          if not self.sync_conn.notifies:
              time.sleep(0.5)
              continue
          self.assertEquals(len(self.sync_conn.notifies), 1)
          self.assertEquals(
              self.sync_conn.notifies.pop(), (pid, "test_notify")
          )
          return
      self.fail("No NOTIFY in 2.5 seconds")
  
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 22 for calling the AsyncTests obj's underlying member method code with example usage: obj.test_notify() without return types