code: def test_longdouble_plus(self):
      self._dll.tf_bD.restype = c_longdouble
      self._dll.tf_bD.argtypes = (c_byte, c_longdouble)
      self.assertEqual(self._dll.tf_bD(0, 42.0), 14.0)
      self.assertEqual(self.S(), 42)
  
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 28 for calling the CFunctions obj's underlying member method code with example usage: obj.test_longdouble_plus() without return types