code: def testSessionWORLD(self):
      comm = MPI.COMM_WORLD
      session = MPI.Session.Init()
      name = "mpi://WORLD"
      info = session.Get_pset_info(name)
      size = comm.Get_size()
      self.assertEqual(info.Get("mpi_size"), str(size))
      info.Free()
      group = session.Create_group(name)
      self.assertEqual(group.Get_size(), comm.Get_size())
      self.assertEqual(group.Get_rank(), comm.Get_rank())
      group.Free()
      session.Finalize()
  
file_path: mpi4py/test/test_session.py
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 7 for calling the TestSession obj's underlying member method code with example usage: obj.testSessionWORLD() without return types