code: def test_c_char(self):
      with self.assertRaises(TypeError) as cm:
          c_char.from_param(b"abc")
      self.assertEqual(
          str(cm.exception),
          "one character bytes, bytearray or integer expected",
      )
  
imports: import _ctypes_test
  import unittest
  import test.support
  from ctypes import CDLL, PyDLL, ArgumentError, Structure, Array, Union, _Pointer, _SimpleCData, _CFuncPtr, POINTER, pointer, byref, c_void_p, c_char_p, c_wchar_p, py_object, c_bool, c_char, c_wchar, c_byte, c_ubyte, c_short, c_ushort, c_int, c_uint, c_long, c_ulong, c_longlong, c_ulonglong, c_float, c_double, c_longdouble
label_desc: Use image node_id 7 for calling the SimpleTypesTestCase obj's underlying member method code with example usage: obj.test_c_char() without return types