LOOPS: Never use unless with else. Rewrite these with the positive case first. BAD unless success? message = 'FAIL' else message = 'PASS' end GOOD if success? message = 'PASS' else puts 'failure'message

Setup on Mac OSX Tools you need: Mac with sudo Access Xcode with command line tools installed. The command line tools can be installed from Xcode -> Preferences -> Downloads RVM (optional) Ruby 2.1.1