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Discussion on: Solve this simple problem with TDD

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michelemauro • Edited

Well Jon, this is more a proof than an implementation. While technically correct, this approach will however fail if you have an infinite (i.e. unknown in advance) array, or a stream.
What you call "responsibilities" I call "the different cases when inspecting next element". My first solution didn't yield a lazy solution like I wanted, however; I should try again and see if the same subdivision that you envision emerges from that approach or not.

The length and depth of your answer, however, begs a question: what really is a test? is the goal of TDD to prove a piece of code "correct", or just that "it works"?

You do prove that your approach is "correct" (for finite length arrays); but is this a "unit test"? Would you call this TDD?