Using a directory watcher to rerun ruby unit tests on file changes was something that helped me do more TDD. Having a terminal open and seeing it turn from red

Using a directory watcher to rerun ruby unit tests on file changes was something that helped me do more TDD. Having a terminal open and seeing it turn from red to green as tests start to pass on every save is a very satisfying feeling. Saving and manually re-running your tests after changing what should make the next test pass is not. Edit: It was guard for those curious: https://github.com/guard/guard-rspec https://github.com/guard/guard-rspec