code: def testConstructorTopocomm(self):
      comm = MPI.COMM_SELF
      with self.assertRaises(TypeError):
          MPI.Topocomm(comm)
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 1 for calling the TestTopoConstructor obj's underlying member method code with example usage: obj.testConstructorTopocomm() without return types