[hartzler]

For me the best line was "You can have the best, most comprehensive test suite in the world, but tests are still different from production.". Getting the business logic working is often the easy part of distributed apps in production environments with real users and unexpected data.

[cpsaltis]

While it is true that most tests are different from production, having a solid test suite can go a long way in moving with startup speed but breaking stuff as little as possible. We (as in me and a couple of others from our startup) have written a howto on using Docker and Ansible to build your test suite a few months ago. Strangely enough, it has almost the same title:

http://blog.mist.io/post/82383668190/move-fast-and-dont-brea...