Chapter 13 Mutation Testing and Web Applications—A Test Driven Development Approach for Web Applications Built with Java Script S. Suguna Mallika and D. Rajya Lakshmi Abstract Defect Prevention refers to the process of ensuring that no defects occur in the first place rather than later detecting defects and correcting them. A test-driven development approach naturally contributes to defect prevention along the software development process pipeline. A generic test suite that suits the testing needs of any web application is needed. The test suite should serve a regression test suite’s purpose to ensure an application’s general health providing a confident user experience. The authors presented a generic set for checking web apps, mutation operators. In this work, the operators’ comprehensive suite is presented as an exhaustive regression test suite to prevent web application defects. Small and medium business enterprises can bank on the regression test suite proposed for customer retention while saving on their testing budgets. The test suite promises a robust web app persistent against any kind of malignant usage. Keywords Mutation testing · Web application testing · Mutation operators · Defect prevention 13.1 Introduction Organizations are increasingly relying on web applications to manage their oper- ations, interdepartmental transactions, project management, etc. Web applications’ flexibility and remote monitoring and management facilities have made them sought after solutions for small and medium and large companies [2]. The business impact created due to web applications’ advent ranges from creating a global opportunity for businesses to ease information. From the reinvention of business models to a customer-centric services offering, web applications made a groundbreaking impact. S. Suguna Mallika (B ) CSE, CVR College of Engineering, Hyderabad, Telangana, India Part-time Research Scholar, JNTUK, Kakinada, Andhra Pradesh, India D. Rajya Lakshmi Professor, CSE, JNTU UCEN, Narsaraopet, Guntur District, Andhra Pradesh, India © The Author(s), under exclusive license to Springer Nature Switzerland AG 2022 P. Kumar et al. (eds.), A Fusion of Artificial Intelligence and Internet of Things for Emerging Cyber Systems, Intelligent Systems Reference Library 210, https://doi.org/10.1007/978-3-030-76653-5_13 243