There has always been a great deal of controversy around automated acceptance tests. Project managers and customers often think they are too expensive to create and maintain—which indeed, when done badly, they are. Many developers believe that unit test suites created through test-driven development are enough to protect against regressions. Our experience has been that the cost of a properly created and maintained automated acceptance test suite is much lower than that of performing frequent manual acceptance and regression testing, or that of the alternative of releasing poor-quality
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