Reek gem is a code smell detector for ruby. It examines Ruby classes, modules, methods and reports any code smells it finds. To install this gem, use: gem install reek USAGE: 1/ Scan the current directory: <pre>$ reek .</pre> 2/ scan specific directories like: <pre>$ reek lib/your/files</pre> To read more about reek gem click here(reek doc) To find up to date details of what exactly reek will check in your code check this(reek wiki)