It might seem a daunting task to develop an entire application with Test-Driven Development (TDD). Until now, all of the examples have been relatively small. The functions and methods have had a tiny, limited scope. How does TDD translate when developing full-fledged applications? Quite well, actually.

Topics discussed in this chapter include:

• Yak shaving
• Big design up front
• YAGNI
• Test small
• Devil's advocate