code: def testGetAccumulate(self):
      group = self.WIN.Get_group()
      size = group.Get_size()
      rank = group.Get_rank()
      group.Free()
      self.WIN.Fence()
      obuf = MPI.Alloc_mem(1)
      memzero(obuf)
      rbuf = MPI.Alloc_mem(1)
      memzero(rbuf)
      try:
          try:
              self.WIN.Get_accumulate(
                  [obuf, 0, MPI.BYTE], [rbuf, 0, MPI.BYTE], rank
              )
              self.WIN.Fence()
          finally:
              MPI.Free_mem(obuf)
              MPI.Free_mem(rbuf)
      except NotImplementedError:
          self.skipTest("mpi-win-get_accumulate")
      self.WIN.Fence()
      for array, typecode in arrayimpl.loop():
          with arrayimpl.test(self):
              if unittest.is_mpi_gpu("openmpi", array):
                  continue
              if unittest.is_mpi_gpu("mvapich2", array):
                  continue
              if typecode in "?":
                  continue
              if typecode in "FDG":
                  continue
              for count in range(10):
                  for rank in range(size):
                      with self.subTest(rank=rank, count=count):
                          ones = array([1] * count, typecode)
                          sbuf = array(range(count), typecode)
                          rbuf = array(-1, typecode, count + 1)
                          gbuf = array(-1, typecode, count + 1)
                          for op in (
                              MPI.SUM,
                              MPI.PROD,
                              MPI.MAX,
                              MPI.MIN,
                              MPI.REPLACE,
                              MPI.NO_OP,
                          ):
                              with win_lock(self.WIN, rank):
                                  self.WIN.Put(ones.as_mpi(), rank)
                                  self.WIN.Flush(rank)
                                  self.WIN.Get_accumulate(
                                      sbuf.as_mpi(),
                                      rbuf.as_mpi_c(count),
                                      rank,
                                      op=op,
                                  )
                                  self.WIN.Flush(rank)
                                  self.WIN.Get(
                                      gbuf.as_mpi_c(count), rank
                                  )
                                  self.WIN.Flush(rank)
                              #
                              for i in range(count):
                                  self.assertEqual(sbuf[i], scalar(i))
                                  self.assertEqual(rbuf[i], scalar(1))
                                  self.assertEqual(
                                      gbuf[i], scalar(op(1, i))
                                  )
                              self.assertEqual(rbuf[-1], scalar(-1))
                              self.assertEqual(gbuf[-1], scalar(-1))
  
imports: from mpi4py import MPI
  import mpiunittest
  import contextlib
  import arrayimpl
  import sys
label_desc: Use image node_id 5 for calling the BaseTestRMA obj's underlying member method code with example usage: obj.testGetAccumulate() without return types