code: def test_uses_stderr_as_default(self):
      input = StringIO("input_string")
      prompt = "some_prompt"
      with mock.patch("sys.stderr") as stderr:
          getpass._raw_input(prompt, input=input)
          stderr.write.assert_called_once_with(prompt)
  
imports: import getpass
  import os
  import unittest
  from io import BytesIO, StringIO, TextIOWrapper
  from unittest import mock
  from test import support
label_desc: Use image node_id 2 for calling the GetpassRawinputTest obj's underlying member method code with example usage: obj.test_uses_stderr_as_default() without return types