new_contents: from collections import namedtuple
  
  Db = namedtuple('Db', '')
  Session = namedtuple('Session', '')
  Service = namedtuple('Service', '')
  Cache = namedtuple('Cache', '')
  
  
  def new_app():
      return Db(), Session(), Service(), Cache()
  
  
  def request(request, db: Db, session: Session, service: Service):
      return request, db, session, service
  
  
  def update_query(db: Db):
      return db
  
  
  def regular_function(a, b, c):
      return a, b, c
  
subject: Add test sample