code: def test_buffer_interface(self):
      self.assertEqual(len(bytearray(create_string_buffer(0))), 0)
      self.assertEqual(len(bytearray(create_string_buffer(1))), 1)
  
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 2 for calling the StringBufferTestCase obj's underlying member method code with example usage: obj.test_buffer_interface() without return types