code: def testTranslRanksGroupEmpty(self):
      if self.GROUP == MPI.GROUP_EMPTY:
          return
      group1 = self.GROUP
      group2 = MPI.GROUP_EMPTY
      ranks1 = list(range(group1.Get_size())) * 2
      ranks2 = MPI.Group.Translate_ranks(group1, ranks1, group2)
      for rank in ranks2:
          self.assertEqual(rank, MPI.UNDEFINED)
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 13 for calling the BaseTestGroup obj's underlying member method code with example usage: obj.testTranslRanksGroupEmpty() without return types