code: def test_ulonglong(self):
      self._dll.tf_Q.restype = c_ulonglong
      self._dll.tf_Q.argtypes = (c_ulonglong,)
      self.assertEqual(
          self._dll.tf_Q(18446744073709551615), 6148914691236517205
      )
      self.assertEqual(self.U(), 18446744073709551615)
  
imports: import unittest
  from ctypes import *
  from ctypes.test import need_symbol
  import _ctypes_test
label_desc: Use image node_id 21 for calling the CFunctions obj's underlying member method code with example usage: obj.test_ulonglong() without return types