I'm working through the problem set in Chapter 6 and have gotten to the point to run the first unit test. However, instead of seeing a NotImplementedException the test is passing. This is because the NBehave "Because_of" override isn't being called. What exactly is supposed to cause "Because_of" to get called?

In Specification.cs, I had

using NBehave.Spec;

and I should have had

using NBehave.Spec.NUnit;

Thanks dannyR! This was my problem too. It was very confusing when the tests weren't failing like they should have!

Thank you. This is my problem too.