Scalable Mutation Testing Using Predictive Analysis of Deep Learning Model

Software testing plays a crucial role in ensuring the quality of software systems. Mutation testing is designed to measure the adequacy of test suites by detecting artificially induced software faults. Despite their potential, the expensive cost and the scalability of mutation testing with large programs is a big obstacle in its practical use. The selective mutation has been widely investigated and considered to be an effective approach to reduce the cost of mutation testing. In the case of large programs where source code has hundreds of classes and more than 10 KLOC lines of code, the selective mutation can still generate thousands of mutants. Executing each mutant against the test suite is cost-intensive in terms of robustness, resource usage, and computational cost. In this paper, we introduce a new approach to extract features from mutant programs based on mutant killing conditions, i.e. reachability, necessity and sufficiency along with mutant significance and test suite metrics to extract features from mutant programs. A deep learning Keras model is proposed to predict
killed
and
alive
mutants from each program. First, the features are extracted using the Eclipse JDT library and program dependency analysis. Second, preprocessing techniques such as Principal Component Analysis and Synthetic Minority Oversampling are used to reduce the high dimensionality of data and to overcome the imbalanced class problem respectively. Lastly, the deep learning model is optimized using fine-tune parameters such as dropout and dense layers, activation function, error and loss rate respectively. The proposed work is analyzed on five opensource programs from GitHub repository consisting of thousands of classes and LOC. The experimental results are appreciable in terms of effectiveness and scalable mutation testing with a slight loss of accuracy.