code: def testNeighborAllgather(self):
      for comm in create_topo_comms(self.COMM):
          rsize, ssize = get_neighbors_count(comm)
          for smess in messages:
              rmess = comm.neighbor_allgather(smess)
              self.assertEqual(rmess, [smess] * rsize)
          comm.Free()
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 1 for calling the BaseTestCCONghObj obj's underlying member method code with example usage: obj.testNeighborAllgather() without return types