code: def testGetName(self):
      name = MPI.COMM_NULL.Get_name()
      self.assertEqual(name, "MPI_COMM_NULL")
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 4 for calling the TestCommNull obj's underlying member method code with example usage: obj.testGetName() without return types