code: def testPickle(self):
      from pickle import dumps, loads
  
      null = loads(dumps(MPI.INFO_NULL))
      self.assertIs(null, MPI.INFO_NULL)
      null = loads(dumps(MPI.Info()))
      self.assertIsNot(null, MPI.INFO_NULL)
      self.assertEqual(null, MPI.INFO_NULL)
  
imports: from mpi4py import MPI
  import mpiunittest
  import sys
label_desc: Use image node_id 2 for calling the TestInfoNull obj's underlying member method code with example usage: obj.testPickle() without return types