I'm personally much faster writing code with tests, and that's why I always do it. You have to test (right?) so how do you do it? Manually? and manual QA? That sounds like a way to not go fast. And unless your system is trivial, over time you will be introducing defects, you can't refactor/rewrite safely without introducing more defects, and a 'big ball of mud' ensues.
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I'm personally much faster writing code with tests, and that's why I always do it. You have to test (right?) so how do you do it? Manually? and manual QA? That sounds like a way to not go fast. And unless your system is trivial, over time you will be introducing defects, you can't refactor/rewrite safely without introducing more defects, and a 'big ball of mud' ensues.