Testing when developing software

Alecco Locco has summarized the SQLite presentation entitled A Lesson In Low-Defect Software at this URL: SQLite: A Lesson In Low-Defect Software. Now, I'm a big fan of SQLite, and this summary has pointed out a few things that I need to improve in my own development process - namely, more comments (apparently SQLite has a comment:code ratio of 2:1), and automated full coverage testing.