When a new software developer joins bunq, a Dutch bank, (s)he will need some time to get familiar with the existing codebase. Preferably, the time necessary for the familiarisation is as short as possible. The faster the developer is up to speed, the faster (s)he can contribute to new features and help solving bugs. This research develops a prototype for a tool that aims to support developers in the comprehension of the PHP backend of bunq. This tool has been evaluated by interviewing multiple developers. Furthermorewe asked the developerswhether the toolwould be able to replace a senior developer regarding question asking. During the interviews feedback was acquired on the current prototype. New developers found the tool useful, although there was also room for improvement. More experienced developers indicated that they found the tool less useful, but saw opportunities to use the tool for more managerial-like tasks.

Software testing is widely recognised as a crucial activity for the development of modern software systems, since it points out defects and errors that were made during the development. Testing also improves the reliability and consistency of an application. However, testing behaviour on mobile devices is not easy because of a number of reasons: (i) manual testing of behaviour requires a lot of valuable time of developers, (ii) the problem of covering all possible operating systems, (iii) covering all possible mobile devices, (iv) and frequently releasing new versions of apps is the industry standard. In addition bugs in mobile apps can cause the reputation of the app on the store to decrease and thereby the the number of downloads. Hence the following question is central to our research: can we automate user interface testing for mobile apps and multiple platforms without human interaction? To overcome the limitation of multi-platform testing, as well as to help non-developers in the creation of tests, we introduce a novel tool that is able to test behaviour on mobile devices by defining expected scenarios. These scenarios consist of simple human readable instructions that are easy to write and understand by non-developers. These scenarios can then be tested against multiple operating systems and devices by simply connecting a device and pressing a button.