code: def testGetName(self):
      name = MPI.DATATYPE_NULL.Get_name()
      self.assertEqual(name, "MPI_DATATYPE_NULL")
  
imports: from mpi4py import MPI
  import mpiunittest
  import struct
label_desc: Use image node_id 2 for calling the TestDatatypeNull obj's underlying member method code with example usage: obj.testGetName() without return types