code: def testCompare(self):
      results = (MPI.IDENT, MPI.CONGRUENT, MPI.SIMILAR, MPI.UNEQUAL)
      ccmp = MPI.Comm.Compare(self.COMM, MPI.COMM_WORLD)
      self.assertIn(ccmp, results)
      ccmp = MPI.Comm.Compare(self.COMM, self.COMM)
      self.assertEqual(ccmp, MPI.IDENT)
      comm = self.COMM.Dup()
      ccmp = MPI.Comm.Compare(self.COMM, comm)
      comm.Free()
      self.assertEqual(ccmp, MPI.CONGRUENT)
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 6 for calling the BaseTestComm obj's underlying member method code with example usage: obj.testCompare() without return types