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I love code which is stable and rigorous, I just don't feel that unit testing is the most effective way to achieve it. I stumbled upon the following question posted on StackOverflow, "What's your most controversial programming opinion? ", and it made me think about my views on unit testing. I have mixed feelings on unit testing. I do use it often, but I find that it does not give me sufficient peace of mind, compared to other code verification techniques. The following is my list of code verification techniques in order of importance: 1. System testing 2. Use the compiler's type checker 3. Use assertions 4. Code reviews 5. Unit testing