code: def test_wchar_ptr(self):
      s = "abcdefghijklmnopqrstuvwxyz\0"
  
      dll = CDLL(_ctypes_test.__file__)
      dll.my_wcsdup.restype = POINTER(c_wchar)
      dll.my_wcsdup.argtypes = (POINTER(c_wchar),)
      dll.my_free.restype = None
      res = dll.my_wcsdup(s[:-1])
      self.assertEqual(res[: len(s)], s)
      self.assertEqual(res[: len(s) :], s)
      self.assertEqual(res[len(s) - 1 : -1 : -1], s[::-1])
      self.assertEqual(res[len(s) - 1 : 5 : -7], s[:5:-7])
  
      with self.assertRaises(TypeError):
          res[:5] = "abcde"
      dll.my_free(res)
  
      if sizeof(c_wchar) == sizeof(c_short):
          dll.my_wcsdup.restype = POINTER(c_short)
      elif sizeof(c_wchar) == sizeof(c_int):
          dll.my_wcsdup.restype = POINTER(c_int)
      elif sizeof(c_wchar) == sizeof(c_long):
          dll.my_wcsdup.restype = POINTER(c_long)
      else:
          self.skipTest("Pointers to c_wchar are not supported")
      res = dll.my_wcsdup(s[:-1])
      tmpl = list(range(ord("a"), ord("z") + 1))
      self.assertEqual(res[: len(s) - 1], tmpl)
      self.assertEqual(res[: len(s) - 1 :], tmpl)
      self.assertEqual(res[len(s) - 2 : -1 : -1], tmpl[::-1])
      self.assertEqual(res[len(s) - 2 : 5 : -7], tmpl[:5:-7])
      dll.my_free(res)
  
file_path: cpython/Lib/test/test_ctypes/test_slicing.py
imports: import _ctypes_test
  import unittest
  from ctypes import CDLL, POINTER, sizeof, c_byte, c_short, c_int, c_long, c_char, c_wchar, c_char_p
label_desc: Use image node_id 6 for calling the SlicesTestCase obj's underlying member method code with example usage: obj.test_wchar_ptr() without return types