code: def test_get_app_static_dir(self):
      self.assertEqual(
          file_util.get_app_static_dir("/some_path/to/app/myapp.py"),
          "/some_path/to/app/static",
      )
  
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 9 for calling the FileUtilTest obj's underlying member method code with example usage: obj.test_get_app_static_dir() without return types