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Testing and refactoring go hand in hand. Refactoring is all about improving code without changing its behavior. Testing is all about making sure you don't change the behavior while you are improving the code.

In the final part of this series you will see how to refactor your tests. Keeping tests clean is important because it will make testing easier to do in the future.

In this article we'll look at an alternative debugging tool for debugging Rails applications (or any Ruby script, for that matter) while still remaining up-to-date with the latest version of the Ruby interpreter. This tool is even slated to be bundled with future releases of Rails.