title: How to test FB messenger bot with multiple users
body: <p>Has anybody yet a way to interact with an FB messenger bot without using real FB accounts? I want to do automated testing and obviously not use real accounts for that.
  I was not able to figure out how to allow access to a page to 'test users' or create a test page and subscribe the test app to it. 
  Any ideas on how to do this?</p>