code: def testSessionSELF(self):
      session = MPI.Session.Init()
      name = "mpi://SELF"
      info = session.Get_pset_info(name)
      self.assertEqual(info.Get("mpi_size"), "1")
      info.Free()
      group = session.Create_group(name)
      self.assertEqual(group.Get_rank(), 0)
      self.assertEqual(group.Get_size(), 1)
      group.Free()
      session.Finalize()
  
file_path: mpi4py/test/test_session.py
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 6 for calling the TestSession obj's underlying member method code with example usage: obj.testSessionSELF() without return types