code: def testIsRevoked(self):
      comm = self.COMM
      try:
          self.assertFalse(comm.Is_revoked())
      except NotImplementedError:
          pass
  
imports: from mpi4py import MPI
  import mpiunittest
  import warnings
  import struct
label_desc: Use image node_id 3 for calling the BaseTestULFM obj's underlying member method code with example usage: obj.testIsRevoked() without return types