People get got up in the silver bullets of programming. They want the one thing that is going to solve every problem, so they keep looking for the right agile methodology, design pattern, language, or whatever.
The Master knows that all thing have their place. That test-driven development doesn't work everywhere shouldn't be any more surprising than that a screwdriver doesn't work any where. However, programmers are often surprised at, start flame wars over, and discuss ad nasuem which One True Method is the right one.
When you can't write the tests first, you don't. When you don't know the right answer ahead of time, use your best guesss until you do. This sort of thinking is easier when you're not casting about for the magic spell that takes care of everything. :)
brian d foy <email@example.com>
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