code: def test_ulong(self):
      self._dll.tf_L.restype = c_ulong
      self._dll.tf_L.argtypes = (c_ulong,)
      self.assertEqual(self._dll.tf_L(4294967295), 1431655765)
      self.assertEqual(self.U(), 4294967295)
  
imports: import unittest
  from ctypes import *
  from ctypes.test import need_symbol
  import _ctypes_test
label_desc: Use image node_id 17 for calling the CFunctions obj's underlying member method code with example usage: obj.test_ulong() without return types