At some point in your Rails career, you’ll run into a controller that’ll make you want to give up programming forever. As great as it would be to just close your eyes and pretend it doesn’t exist, someday you’ll have to fix a bug in one of these controllers. And, being a good software developer, you want to leave the code better than you found it. But how do you refactor it, especially if you don’t have good tests to rely on?