Behaviour driven tests are also a great way to make sure that the requirements aren’t forgotten about as the project progresses. There’s no better way to show progress than when you can easily show how many tests are passing at any point in time.
This approach is not too dissimilar from something that you might see in a business case. After all, the more we understand about the business drivers, the more we can reduce assumptions, and focus on the real, underlying problems.
