Behavior-driven development (BDD) is a programming paradigm that emphasizes defining behavioral characteristics of your code before actually writing any code. An example is if I'm defining a calculator controller my calculator should return 2 when given the equation 1 + 1, should return an error when trying to do division by 0, etc. By clearly defining what your code should do before writing it, it makes it much easier to write solid, test-covered code upfront and makes it a cinch to debug as you go along because you're immediately alerted whenever new functionality accidentally breaks legacy portions of your codebase.
I've found BDD much more intuitive than TDD (test-driven development). The above video by Dave Astels, one of the original developers of rSpec, gives a nice overview of BDD vs. TDD and the pros of the former. Also touches on the benefits of using a dynamic language like Ruby.
In Conclusion,
Pretty neat...
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