code: def test_struct_W(self):
      class X(Structure):
          _fields_ = [("a", c_wchar * 3)]
  
      x = X("abc")
      self.assertRaises(TypeError, X, b"abc")
      self.assertEqual(x.a, "abc")
      self.assertEqual(type(x.a), str)
  
file_path: cpython/Lib/test/test_ctypes/test_bytes.py
imports: import sys
  import unittest
  from _ctypes import _SimpleCData
  from ctypes import Structure, c_char, c_char_p, c_wchar, c_wchar_p
label_desc: Use image node_id 6 for calling the BytesTest obj's underlying member method code with example usage: obj.test_struct_W() without return types