code: def testWaitsome(self):
      ret = MPI.Request.Waitsome(self.REQUESTS)
      self.assertIsNone(ret)
      ret = MPI.Request.Waitsome(self.REQUESTS, None)
      self.assertIsNone(ret)
      for statuses in (self.STATUSES, []):
          slen = len(statuses)
          ret = MPI.Request.Waitsome(self.REQUESTS, statuses)
          self.assertIsNone(ret)
          self.assertEqual(len(statuses), slen)
  
file_path: mpi4py/test/test_request.py
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 8 for calling the TestRequestArray obj's underlying member method code with example usage: obj.testWaitsome() without return types