text: import unittest
  import ctypes
  from ctypes.test import need_symbol
  
  import _ctypes_test
  
  @need_symbol('c_wchar')
  class UnicodeTestCase(unittest.TestCase):
      def test_wcslen(self):
          dll = ctypes.CDLL(_ctypes_test.__file__)
          wcslen = dll.my_wcslen
          wcslen.argtypes = [ctypes.c_wchar_p]
  
          self.assertEqual(wcslen("abc"), 3)
          self.assertEqual(wcslen("ab\u2070"), 3)
          self.assertRaises(ctypes.ArgumentError, wcslen, b"ab\xe4")
  
      def test_buffers(self):
          buf = ctypes.create_unicode_buffer("abc")
          self.assertEqual(len(buf), 3+1)
  
          buf = ctypes.create_unicode_buffer("ab\xe4\xf6\xfc")
          self.assertEqual(buf[:], "ab\xe4\xf6\xfc\0")
          self.assertEqual(buf[::], "ab\xe4\xf6\xfc\0")
          self.assertEqual(buf[::-1], '\x00\xfc\xf6\xe4ba')
          self.assertEqual(buf[::2], 'a\xe4\xfc')
          self.assertEqual(buf[6:5:-1], "")
  
  func = ctypes.CDLL(_ctypes_test.__file__)._testfunc_p_p
  
  class StringTestCase(UnicodeTestCase):
      def setUp(self):
          func.argtypes = [ctypes.c_char_p]
          func.restype = ctypes.c_char_p
  
      def tearDown(self):
          func.argtypes = None
          func.restype = ctypes.c_int
  
      def test_func(self):
          self.assertEqual(func(b"abc\xe4"), b"abc\xe4")
  
      def test_buffers(self):
          buf = ctypes.create_string_buffer(b"abc")
          self.assertEqual(len(buf), 3+1)
  
          buf = ctypes.create_string_buffer(b"ab\xe4\xf6\xfc")
          self.assertEqual(buf[:], b"ab\xe4\xf6\xfc\0")
          self.assertEqual(buf[::], b"ab\xe4\xf6\xfc\0")
          self.assertEqual(buf[::-1], b'\x00\xfc\xf6\xe4ba')
          self.assertEqual(buf[::2], b'a\xe4\xfc')
          self.assertEqual(buf[6:5:-1], b"")
  
  
  if __name__ == '__main__':
      unittest.main()
  