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Description of  Developer Testing: Building Quality into Software (Addison-Wesley Signature Series (Cohn))

How do successful agile teams deliver bug-free, maintainable softwareiteration after iteration? The answer is: By seamlessly combining development and testing. On such teams, the developers write testable code that enables them to verify it using various types of automated tests. This approach keeps regressions at bay and prevents testing cruncheswhich otherwise may occur near the end of an iterationfrom ever happening. Writing testable code, however, is often difficult, because it requires knowledge and skills that cut across multiple disciplines. Read more