code: def test_buffer():
      assert get_buffer(b"test string")
  
imports: from ctypes import byref, POINTER, c_int, c_char, c_char_p, c_void_p, py_object, c_ssize_t, pythonapi, Structure
label_desc: Use image node_id 2 for calling a global function with example usage: test_buffer() without return types