Thanks for the link. Would it be possible to elaborate as to how doing TDD made the algorithm evolve for you? "TDD/BDD in one form or another". Theres the rub.

Thanks for the link. Would it be possible to elaborate as to how doing TDD made the algorithm evolve for you? "TDD/BDD in one form or another". Theres the rub. That form mostly doesnt involve red-green-refactor and make the algorithm evolve from their tests. A lot of famous, widely-used open source software have tests, but doesnt mean they used red-green-refactor TDD. If you read my comment below the title, I am specifically looking for software that used the TDD method as prescribed by agile methodologists.