code: def testAllgather(self):
      rank = self.INTERCOMM.Get_rank()
      size = self.INTERCOMM.Get_size()
      rsize = self.INTERCOMM.Get_remote_size()
      for smess in messages + [messages]:
          rmess = self.INTERCOMM.allgather(smess)
          self.assertEqual(rmess, [smess] * rsize)
  
imports: from mpi4py import MPI
  import mpiunittest
  from functools import reduce
label_desc: Use image node_id 7 for calling the BaseTestCCOObjInter obj's underlying member method code with example usage: obj.testAllgather() without return types