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Testing legacy code

Note: This article was originally published at Planet PHP on 31 July 2010.
Planet PHP
Today we know about the benefits of Test Driven Development and normally also start new projects using TDD. Most projects from the last couple of years integrated this method in their daily development process, which often results in in good code coverage results of 90% and above. But what about all the other old projects, you still manage in your daily work?