code: def testTestall(self):
      MPI.Request.Testall(self.REQUESTS)
      MPI.Request.Testall(self.REQUESTS, None)
      self.assertIs(MPI.Request.Testall(self.REQUESTS), True)
      for statuses in (self.STATUSES, []):
          MPI.Request.Testall(self.REQUESTS, statuses)
          self.assertEqual(len(statuses), len(self.REQUESTS))
      MPI.Request.testall(self.REQUESTS)
      MPI.Request.testall(self.REQUESTS, None)
      for statuses in (self.STATUSES, []):
          MPI.Request.testall(self.REQUESTS, statuses)
          self.assertEqual(len(statuses), len(self.REQUESTS))
  
file_path: mpi4py/test/test_request.py
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 6 for calling the TestRequestArray obj's underlying member method code with example usage: obj.testTestall() without return types