code: def test_longlong_plus(self):
      self._dll.tf_bq.restype = c_longlong
      self._dll.tf_bq.argtypes = (c_byte, c_longlong)
      self.assertEqual(
          self._dll.tf_bq(0, -9223372036854775806), -3074457345618258602
      )
      self.assertEqual(self.S(), -9223372036854775806)
  
imports: import unittest
  from ctypes import *
  from ctypes.test import need_symbol
  import _ctypes_test
label_desc: Use image node_id 20 for calling the CFunctions obj's underlying member method code with example usage: obj.test_longlong_plus() without return types