<A target="_blank" href="http://www.wissel.net/blog/d6plinks/SHWL-8GYC6A?Open&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+Wisselnet+%28wissel.net%29">Stephan Wissel says testing should not be an afterthought.</A> To do it correctly, you should plan your tests before writing your code. He offers tips on software to help in your testing.