code: def app():
      return APPLICATION
  
file_path: perspective/python/perspective/perspective/tests/handlers/test_tornado_handler.py
imports: import random
  import pytest
  import tornado
  from datetime import datetime
  from perspective import Table, PerspectiveManager, PerspectiveTornadoHandler, PerspectiveError, tornado_websocket
label_desc: Use image node_id 1 for calling a global function with example usage: app() and returns: APPLICATION