The screenshot testing tool offers two modes: record and verifyġ.
A Gradle plugin which is responsible for pulling the screenshots from the external storage and performing further processing depending on the mode. When running your tests, the screenshots get stored on the external storage of your device/emulator.Ģ. A core plugin which provides an API for your test code to capture screenshots. The screenshot testing tool consists of two parts:ġ.
JUnit test report XML generation suitable for CI integration.Automation of storage runtime permission handling for Android M and above.Our fork extends the existing tool with the following functionality: In order to meet our requirements, we forked the library and extended the feature set. One of the nice things about the library is that it allows you to screenshot test Android UI widgets without embedding them into an activity, thus allowing you to truly stand-alone test your widget. Luckily, Facebook published a screenshot-tests-for-android library a while ago. Introducing the screenshot testing libraryĪt the moment, the Android Testing Support Library does not offer any tool to perform screenshot tests. The only difference is that for assertion the rendered image is compared to a reference image. If both images are equal, the test succeeds – otherwise it fails.Ī screenshot test is quite similar to a UI test. This image is then compared to a “reference image”. Screenshot testing uses instrumented UI tests to render a screen or a portion of a screen to an image. How does screenshot testing work in general?
In this blog post, we’ll show you how that works and how you can apply screenshot testing for your projects too. With screenshot testing, we can test our UI components against visual regressions under various conditions. At Runtastic, our Android engineers share a lot of UI components across our apps. Nowadays tools like Mockito and Espresso make it easy to write unit and UI tests for Android. Testing on Android has come a long way over the past few years. By Markus Hintersteiner, Software Architect Android
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