title: Flask: are blueprints necessary for app factories?
body: <p>I want to have several app factories(currently: one for development, and another one for testing). I am wondering what is the proper way to implement them. </p>
  
  <p>Currently I use app object to register views(via <code>@app.route()</code> decorator). Do I need to start using blueprints(instead of app) to register views? Is there any way to have proper  app factories without blueprients?</p>