code: def testGetFree(self):
      mpiobj = self.mpiobj
      errhdls = []
      for i in range(100):
          e = mpiobj.Get_errhandler()
          errhdls.append(e)
      for e in errhdls:
          e.Free()
      for e in errhdls:
          self.assertEqual(e, MPI.ERRHANDLER_NULL)
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 3 for calling the BaseTestErrhandler obj's underlying member method code with example usage: obj.testGetFree() without return types