code: def testStartCompletePostWait(self):
      win = self.WIN
      wingroup = win.Get_group()
      size = wingroup.Get_size()
      rank = wingroup.Get_rank()
      if size < 2:
          return wingroup.Free()
      if rank == 0:
          group = wingroup.Excl([0])
          win.Start(group)
          win.Complete()
          win.Post(group)
          win.Wait()
          group.Free()
      else:
          group = wingroup.Incl([0])
          win.Post(group)
          win.Wait()
          win.Start(group)
          win.Complete()
          group.Free()
      wingroup.Free()
  
imports: from mpi4py import MPI
  import mpiunittest
  import contextlib
  import arrayimpl
  import sys
label_desc: Use image node_id 17 for calling the BaseTestRMA obj's underlying member method code with example usage: obj.testStartCompletePostWait() and returns: wingroup