I’m impressed with the level of coverage NUnit’s tests achieve, although it’s a project you’d expect to have good unit tests. So far, however, it seems NUnit is unusual as far as .NET open source projects go. Most I have looked at so far have very little unit testing support evident. I don’t know if this is a cultural difference between Java and .NET open source projects in general or just a function of the Java projects I tend to look at and the .NET projects I’ve managed to find. I’m still looking.