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Software testing is an important phase in the software development life-cyclebecause it helps in identifying bugs in a software system before it is shippedinto the hand of its end users. There are numerous studies on how developerstest general-purpose software applications. The idiosyncrasies of mobilesoftware applications, however, set mobile apps apart from general-purposesystems (e.g., desktop, stand-alone applications, web services). This paperinvestigates working habits and challenges of mobile software developers withrespect to testing. A key finding of our exhaustive study, using 1000 Androidapps, demonstrates that mobile apps are still tested in a very ad hoc way, iftested at all. However, we show that, as in other types of software, testingincreases the quality of apps (demonstrated in user ratings and number of codeissues). Furthermore, we find evidence that tests are essential when it comesto engaging the community to contribute to mobile open source software. Wediscuss reasons and potential directions to address our findings. Yet anotherrelevant finding of our study is that Continuous Integration and ContinuousDeployment (CI/CD) pipelines are rare in the mobile apps world (only 26% of theapps are developed in projects employing CI/CD) --- we argue that one of themain reasons is due to the lack of exhaustive and automatic testing.

To the Attention of Mobile Software Developers: Guess What, Test your App!