code: def testRequest(self):
      req = self.RequestType()
      self.assertFalse(req)
      self.assertEqual(req, self.RequestType())
      req = self.RequestType(MPI.REQUEST_NULL)
      self.assertFalse(req)
      self.assertEqual(req, MPI.REQUEST_NULL)
      self.assertEqual(req, self.RequestType())
  
imports: from mpi4py import MPI
  from mpi4py.util import pkl5
  import sys, os
label_desc: Use image node_id 21 for calling the BaseTest obj's underlying member method code with example usage: obj.testRequest() without return types