Android Apps are frequently updated, every couple of weeks, to keep up with changing user, hardware and business demands. Correctness of App updates is checked through extensive testing. Recent research has proposed tools for automated GUI event generation in Android Apps. These techniques, however, are not efficient at checking App updates as the generated GUI events do not prioritise updates, and instead explore other App behaviours. We address this need in this paper with CAT (Change-focused Android GUI Testing). For App updates, at the source code or GUI level, CAT performs change impact analysis to identify GUI elements affected by the update. CAT then generates length-3 GUI event sequences to interact with these GUI elements. Our empirical evaluations using 21 publicly available open source Android Apps demonstrated that CAT is able to automatically identify GUI elements affected by App updates, generate and execute length-3 GUI event sequences focusing on change-affected GUI elements. Comparison with two popular GUI event generation tools, DroidBot and DroidMate, revealed that CAT was more effective at interacting with the change-affected GUI elements. Finally, CAT was able to detect previously unknown change-related bugs in two Apps.

中文翻译：

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CAT：以变更为中心的Android GUI测试

Android Apps每两周进行一次更新，以适应不断变化的用户，硬件和业务需求。应用更新的正确性通过广泛的测试来检查。最近的研究提出了用于在Android Apps中自动生成GUI事件的工具。但是，这些技术在检查App更新时效率不高，因为生成的GUI事件不会优先考虑更新，而是探究其他App行为。我们在本文中通过CAT（面向变更的Android GUI测试）满足了这一需求。对于App更新，CAT在源代码或GUI级别上执行更改影响分析，以识别受更新影响的GUI元素。CAT然后生成长度为3的GUI事件序列，以与这些GUI元素进行交互。我们使用21个可公开获取的开源Android应用程序进行的经验评估表明，CAT能够自动识别受应用程序更新影响的GUI元素，生成并执行长度为3的GUI事件序列，重点关注受更改影响的GUI元素。通过与两种流行的GUI事件生成工具DroidBot和DroidMate进行比较，发现CAT在与受变更影响的GUI元素进行交互方面更为有效。最终，CAT能够在两个应用程序中检测到以前未知的与变更相关的错误。