In this chapter, we looked at how to apply the skills covered in earlier parts of this book. We did this by stepping through a recording of your humble author's actual process in writing a package. At the same time, you had the chance to work through your own project, making your own decisions, and designing your own tests. You've taken the lead in a test-driven project, and you should be able to do it again whenever you want.
Now that we've covered the heart of Python testing, we're ready to talk about testing web-based user interfaces with Python and Twill—which is the topic of the next chapter.