TY - GEN PB - ACM N1 - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions. SP - 397 Y1 - 2014/09/15/ ID - discovery1456659 TI - Angels and monsters: An empirical investigation of potential test effectiveness and efficiency improvement from strongly subsuming higher order mutation T3 - IEEE/ACM International Conference on Automated Software Engineering A1 - Harman, M A1 - Jia, Y A1 - Mateo, PR A1 - Polo, M UR - http://dx.doi.org/10.1145/2642937.2643008 N2 - We study the simultaneous test effectiveness and efficiency improvement achievable by Strongly Subsuming Higher Order Mutants (SSHOMs), constructed from 15,792 first order mutants in four Java programs. Using SSHOMs in place of the first order mutants they subsume yielded a 35%-45% reduction in the number of mutants required, while simultaneously improving test efficiency by 15% and effectiveness by between 5.6% and 12%. Trivial first order faults often combine to form exceptionally non-trivial higher order faults; apparently innocuous angels can combine to breed monsters. Nevertheless, these same monsters can be recruited to improve automated test effectiveness and efficiency. AV - public EP - 408 CY - New York, USA ER -