code: def test_buffer(self):
      b = create_string_buffer(32)
      self.assertEqual(len(b), 32)
      self.assertEqual(sizeof(b), 32 * sizeof(c_char))
      self.assertIs(type(b[0]), bytes)
  
      b = create_string_buffer(b"abc")
      self.assertEqual(len(b), 4)  # trailing nul char
      self.assertEqual(sizeof(b), 4 * sizeof(c_char))
      self.assertIs(type(b[0]), bytes)
      self.assertEqual(b[0], b"a")
      self.assertEqual(b[:], b"abc\0")
      self.assertEqual(b[::], b"abc\0")
      self.assertEqual(b[::-1], b"\0cba")
      self.assertEqual(b[::2], b"ac")
      self.assertEqual(b[::5], b"a")
  
      self.assertRaises(TypeError, create_string_buffer, "abc")
  
file_path: cpython/Lib/test/test_ctypes/test_buffers.py
imports: import unittest
  from ctypes import create_string_buffer, create_unicode_buffer, sizeof, c_char, c_wchar
label_desc: Use image node_id 1 for calling the StringBufferTestCase obj's underlying member method code with example usage: obj.test_buffer() without return types