So it's been awhile since I've contributed anything so I thought I'd provide my CppUnit interface for use with DarkGDK. If you're familiar with unit-testing in general, then you may find this useful.
Check out the readme.txt file. It leads you to some resources that will help you download, compile and setup CppUnit in your environment. It then walks you through how to setup a set of GDK projects for use with it: one main "game" project (if you will) and one "test" project.
Additionally, there is a BasicSampleTests.cpp file which will help illustrate how to get GDK to work within a test unit.
If there's enough interest in this, maybe I'll put together a more in depth "training" tutorial...
I hope you all find this as useful as I have been,
JTK