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Context. Refactoring has been widely investigated in the past in relation toproduction code quality, yet still little is known on how developers applyrefactoring on test code. Specifically, there is still a lack of investigationinto how developers typically refactor test code and its effects on test codequality and effectiveness. Objective. This paper presents a research agendaaimed to bridge this gap of knowledge by investigating (1) whether testrefactoring actually targets test classes affected by quality and effectivenessconcerns and (2) the extent to which refactoring contributes to the improvementof test code quality and effectiveness. Method. We plan to conduct anexploratory mining software repository study to collect test refactoring dataof open-source Java projects from GitHub and statistically analyze them incombination with quality metrics, test smells, and code/mutation coverageindicators. Furthermore, we will measure how refactoring operations impact thequality and effectiveness of test code.

Test Code Refactoring Unveiled: Where and How Does It Affect Test Code Quality and Effectiveness?