code: def test_empty_pythonpath(self):
      with patch("os.environ", {"PYTHONPATH": ""}):
          self.assertFalse(
              file_util.file_in_pythonpath(
                  self._make_it_absolute("something/dir1/dir2/module")
              )
          )
  
imports: import errno
  import os
  import unittest
  from unittest.mock import MagicMock, mock_open, patch
  import pytest
  from streamlit import file_util, util
label_desc: Use image node_id 3 for calling the FileInPythonPathTest obj's underlying member method code with example usage: obj.test_empty_pythonpath() without return types