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Regression testing is used by software developers to ensure that program modifications have not negatively impacted the correctness of code. While regression testing has been successfully applied in many domains, programs such as web applications, XML processors, and compilers remain expensive to test because harmless program evolutions make the tests appear to fail: in the authors' experiments 82% of test case output differences are false positives. They present an automated tool that measures syntactic differences in the tree-structured output of such programs to reduce the number of false positives in, and thus the cost of, regression testing.
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