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Regression testing is performed to provide confidence that changes in a partof software do not affect other parts of the software. An execution of allexisting test cases is the best way to re-establish this confidence. However,regression testing is an expensive process---there might be insufficientresources (e.g., time, workforce) to allow for the re-execution of all testcases. Regression test prioritization techniques attempt to re-order aregression test suite based on some criteria so that highest priority testcases are executed earlier.  In this study, we want to prioritize test cases for regression testing basedon the dependency network of faults. In software testing, it is common thatsome faults are consequences of other faults (leading faults). Moreover,dependent faults can be removed if and only if the leading faults have beenremoved. Our goal is to prioritize test cases so that test cases that exposedleading faults (the most central faults in the fault dependency network) in thesystem testing phase, are executed first in regression testing.  We present ComReg, a test case prioritization technique based on thedependency network of faults. We model a fault dependency network as a directedgraph and identify leading faults to prioritize test cases for regressiontesting. We use a centrality aggregation technique which considers six networkrepresentative centrality metrics to identify leading faults in the faultdependency network. We also discuss the use of fault communities to select anarbitrary percentage of the test cases from a prioritized regression testsuite. We conduct a case study that evaluates the effectiveness andapplicability of the proposed method.

ComReg: A Complex Network Approach to Prioritize Test Cases for Regression Testing