code: def tearDown(self):
      self.INFO.Free()
      self.assertEqual(self.INFO, MPI.INFO_NULL)
      self.INFO = None
  
imports: from mpi4py import MPI
  import mpiunittest
  import sys
label_desc: Use image node_id 2 for calling the TestInfo obj's underlying member method code with example usage: obj.tearDown() without return types