Not I. I write code until I see errors, debug to find those errors, and add internal consistency checks (asserts, etc.) to make sure they don't happen again. "Test first development" seems to me to be a blunt tool for people who don't understand their code, or even make a serious effort to do so.
On the other hand, you'll get serious XP on Perlmonks for saying you test first.
EDIT: Thank you, downvoters, for making my point.
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