This reminds me of something I've been saying for a while. I'm a practitioner of TDD - Test Driven Development, not Test Driven Design. I like test-first coding not because it's faster, as many proponents claim, but because it's more comfortable and thoughtful. It forces me to slow down and think about what I'm actually doing. I don't think I'm any faster when I'm coding to tests. I do, however, feel much safer. I hate that feeling of cranking out a bunch of code, then it breaks, and I don't know what broke or why.
But good design is absolutely not an emergent property of the process of coding! Thoughtless coding leads to poorly structured spaghetti. Well-tested spaghetti is still spaghetti! Good design is always a matter of compromises. You can either make those compromises in a conscious and thoughtful way, or you can close your eyes and hope for the best. Good luck with that.