code: def testDup(self):
      info = self.INFO.Dup()
      self.assertNotEqual(self.INFO, info)
      self.assertEqual(info.Get_nkeys(), 0)
      info.Free()
      self.assertFalse(info)
  
imports: from mpi4py import MPI
  import mpiunittest
  import sys
label_desc: Use image node_id 6 for calling the TestInfo obj's underlying member method code with example usage: obj.testDup() without return types