code: def testAHandleOf(self):
      for obj in self.objects:
          hdl = MPI._handleof(obj)
          self.assertGreaterEqual(hdl, 0)
      with self.assertRaises(TypeError):
          MPI._handleof(None)
  
imports: from mpi4py import MPI
  import mpiunittest
  import ctypes
  import operator
  import weakref
  import sys
label_desc: Use image node_id 13 for calling the TestObjModel obj's underlying member method code with example usage: obj.testAHandleOf() without return types