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Agile and testing

Over the Christmas holidays I finally had time to read the excellent report "Scrum and XP from the Trenches". In it Henrik Kniberg describes in great detail how his company has implemented Scrum. Most notable is that he does not spare out the trails and errors they encountered along the way and also describes the problematic areas. One of them: testing. In Scrum you produce a release every, say, 3 weeks. The term "release" IMO implies that the software is tested (otherwise it might be just another build). In order to get that done you will need to code test-driven (well, duh, it's agile after all). That means: unit tests and back box tests. The latter are often much harder to implement and a pain to set up (so save some time at the beginning of your project to get the infrastructure right). But even then you might find that there is a remaining part of your system which you need to test manually. And that will be the same repetitive process every three weeks. That's painful. I wonder how Kent intends us to do this. Any experience/opinions?

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