code: def assertIsSigned(self, ctype):
      self.assertLess(ctype(-1).value, 0)
  
file_path: cpython/Lib/test/test_ctypes/test_wintypes.py
imports: import unittest
  from ctypes import POINTER, cast, c_int16
  from ctypes import wintypes
label_desc: Use image node_id 2 for calling the WinTypesTest obj's underlying member method code with example usage: obj.assertIsSigned(ctype) without return types