code: def testConstructorIntra(self):
      comm_null = MPI.Intracomm()
      self.assertEqual(comm_null, MPI.COMM_NULL)
      self.assertIsNot(comm_null, MPI.COMM_NULL)
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 2 for calling the TestCommNull obj's underlying member method code with example usage: obj.testConstructorIntra() without return types