Here's a blog from someone who is simulating an XP project from start to finish. I find that the test naming are less than perfect, but I should read more before commenting on the real "meat".

So far it seems to be delving mostly into Test Driven Development and unit testing (from a brief scroll down the blog).

"This blog will simulate an XP project, from start to finish using the XP methodology. I won't be able to work on it continuously, or at least in true XP form (working live with customers and other developers), but it will simulate the actual experience on a project. This is meant to be a learning experimentation for developers and customers alike, as well as for me. I am not an XP expert, and so I welcome comments from users to help keep me on the right track, which I will edit my old posts to ensure correctness of the approach."