This example of the string calculator kata from Roy Osherove was written using nose style unit tests and nosy to watch for file changes. To reduce reliance on the detailed output, rednose is used to colorize the success failure output.
You can run the tests after the fact by runing nosetests, or to go into watch for file changes mode run nosy.
The setup.cfg file is the configuration nosy uses to decide where to watch for changes and what tests to run.
I was using iTerm and a three pane setup as seen here.