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 _ctypes_test
  import ctypes
  import unittest
  from ctypes import CDLL, c_byte, c_ubyte, c_char, c_short, c_ushort, c_int, c_uint, c_long, c_ulong, c_longlong, c_ulonglong, c_float, c_double, c_longdouble
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