Today we where working on a little Twilio integration. On incoming calls twilio sends a request to a pre-determined url of your web application.
Testing this kind of stuff by constantly deploying to a test environment could become quickly tedious. Instead we found a better solution as explained in this article: https://www.twilio.com/blog/2013/10/test-your-webhooks-locally-with-ngrok.html
Ngrok can also be used for other type of testing, check it out: https://ngrok.com/