Mujava: a mutation system for java

Mutation testing is a valuable experimental research tech-nique that has been used in many studies. It has been experimentally compared with other test criteria, and also used to support experimental comparisons of other test cri-teria, by using mutants as a method to create faults. In effect, mutation is often used as a “gold standard ” for ex-perimental evaluations of test methods. Although mutation testing is powerful, it is a complicated and computationally expensive testing method. Therefore, automated tool sup-port is indispensable for conducting mutation testing. This demo presents a publicly available mutation system for Java that supports both method-level mutants and class-level mu-tants. MuJava can be freely downloaded and installed with relative ease under both Unix and Windows. MuJava is of-fered as a free service to the community and we hope that it will promote the use of mutation analysis for experimental research in software testing