code: def testConstructor(self):
      comm = MPI.Comm(self.COMM)
      self.assertEqual(comm, self.COMM)
      self.assertIsNot(comm, self.COMM)
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 1 for calling the BaseTestComm obj's underlying member method code with example usage: obj.testConstructor() without return types