Amen. I'm going to pass this article around to doubting colleagues of mine. TDD saves my (and Forrst's) ass on probably a daily basis. The most recent debacle

Amen. I'm going to pass this article around to doubting colleagues of mine. TDD saves my (and Forrst's) ass on probably a daily basis. The most recent debacle with our rather complicated post formatting library (which involves Markdown, autolinking emails, usernames, URLs [but ignoring all content in pre or code blocks, and not double-linking URLs in href or src attributes], XSS cleaning/sanitization, and tag rebalancing), would have likely been 1000x worse without a comprehensive test suite. There's just no way to test every possible case manually.