code: def testCommLock(self):
      comm = self.COMM.Dup()
      table = MPI._comm_lock_table(comm)
      self.assertIsInstance(table, dict)
      self.assertNotIn("bcast", table)
      comm.bcast(None, root=0)
      self.assertIn("bcast", table)
      lock = table["bcast"]
      lock_type = type(threading.Lock())
      self.assertIsInstance(lock, lock_type)
      comm.Free()
  
imports: from mpi4py import MPI
  import mpiunittest
  import threading
  import warnings
  import sys
label_desc: Use image node_id 23 for calling the BaseTestP2PObj obj's underlying member method code with example usage: obj.testCommLock() without return types