@dwellman We'd generally use the Lens in most of our functional tests for the apps. Of course, there is still a testing hole there - if you don't have any kind of test which shows the exact JSON that is returned for a lensed message object then you could break your clients easily. So we tend to have at least some tests which explicitly show the JSON structure for the various messages, and okey-doke gives you a nice visual way of showing that JSON which isn't embedded into your test class files