code: def testTestAll(self):
      comm = self.COMM
      size = comm.Get_size()
      rank = comm.Get_rank()
      requests = []
      for smess in messages:
          req = comm.issend(smess, rank)
          requests.append(req)
      flag, _ = self.RequestType.testall(requests)
      self.assertFalse(flag)
      flag, obj = self.RequestType.testall(requests)
      self.assertFalse(flag)
      self.assertIsNone(obj)
      comm.barrier()
      for smess in messages:
          rmess = comm.recv(None, rank)
          self.assertEqual(rmess, smess)
      flag = False
      while not flag:
          flag, obj = self.RequestType.testall(requests)
      self.assertEqual(obj, [None] * len(messages))
      flag, _ = self.RequestType.testall(requests)
      self.assertTrue(flag)
  
imports: from mpi4py import MPI
  from mpi4py.util import pkl5
  import sys, os
label_desc: Use image node_id 11 for calling the BaseTest obj's underlying member method code with example usage: obj.testTestAll() without return types