Behavior/test-driven development needs all the hype it can get. There are so many developers, even entire software development subcommunities (I'm looking at you, video game developers) who haven't written a single test in their lives and don't understand its value.
Yes, it is time-consuming and invisible to your customers, but I imagine so is setting up a frame for a house instead of just stacking bricks. The structure, flexibility and peace of mind you get from a comprehensive test suite pays off when you have a 50-brick tall structure to put a roof on.
In my experience test-driven development is not time consuming, even for small developments. I don't think we even need to say things like "yes it takes time now but it will pay off later". I have found that it saves time right from the beginning. It seems other people have a similar experience : http://blog.8thlight.com/uncle-bob/2013/03/11/TheFrenziedPan...
Yes, it is time-consuming and invisible to your customers, but I imagine so is setting up a frame for a house instead of just stacking bricks. The structure, flexibility and peace of mind you get from a comprehensive test suite pays off when you have a 50-brick tall structure to put a roof on.