code: def get_app(self):
      return tornado.web.Application(
          [
              (
                  r"/app/static/(.*)",
                  AppStaticFileHandler,
                  {"path": "%s" % self._tmpdir.name},
              )
          ]
      )
  
file_path: streamlit/lib/tests/streamlit/web/server/app_static_file_handler_test.py
imports: import os
  import tempfile
  from unittest.mock import MagicMock, patch
  import tornado.httpserver
  import tornado.testing
  import tornado.web
  import tornado.websocket
  from streamlit.web.server.app_static_file_handler import MAX_APP_STATIC_FILE_SIZE, AppStaticFileHandler
label_desc: Use image node_id 3 for calling the AppStaticFileHandlerTest obj's underlying member method code with example usage: obj.get_app() and returns: tornado