code: def test_ubyte(self):
      self._dll.tf_B.restype = c_ubyte
      self._dll.tf_B.argtypes = (c_ubyte,)
      self.assertEqual(self._dll.tf_B(255), 85)
      self.assertEqual(self.U(), 255)
  
imports: import unittest
  from ctypes import *
  from ctypes.test import need_symbol
  import _ctypes_test
label_desc: Use image node_id 5 for calling the CFunctions obj's underlying member method code with example usage: obj.test_ubyte() without return types