code: def test_wchar_parm(self):
      f = dll._testfunc_i_bhilfd
      f.argtypes = [c_byte, c_wchar, c_int, c_long, c_float, c_double]
      result = f(1, "x", 3, 4, 5.0, 6.0)
      self.assertEqual(result, 139)
      self.assertEqual(type(result), int)
  
      with self.assertRaises(ArgumentError) as cm:
          f(1, 2, 3, 4, 5.0, 6.0)
      self.assertEqual(
          str(cm.exception),
          "argument 2: TypeError: unicode string expected "
          "instead of int instance",
      )
  
      with self.assertRaises(ArgumentError) as cm:
          f(1, "abc", 3, 4, 5.0, 6.0)
      self.assertEqual(
          str(cm.exception),
          "argument 2: TypeError: one character unicode string "
          "expected",
      )
  
imports: import _ctypes_test
  import ctypes
  import sys
  import unittest
  from ctypes import CDLL, Structure, Array, CFUNCTYPE, byref, POINTER, pointer, ArgumentError, c_char, c_wchar, c_byte, c_char_p, c_wchar_p, c_short, c_int, c_long, c_longlong, c_void_p, c_float, c_double, c_longdouble
  from _ctypes import _Pointer, _SimpleCData
label_desc: Use image node_id 3 for calling the FunctionTestCase obj's underlying member method code with example usage: obj.test_wchar_parm() without return types