code: def testProperties(self):
      group = self.GROUP
      self.assertEqual(group.Get_size(), group.size)
      self.assertEqual(group.Get_rank(), group.rank)
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 1 for calling the BaseTestGroup obj's underlying member method code with example usage: obj.testProperties() without return types