Screenshot Tests for Android
screenshot-tests-for-android is a library that can generate fast deterministic screenshots while running instrumentation tests on Android.
We mimic Android's measure(), layout() and draw() to generate screenshots on the test thread. By not having to do the rendering on a separate thread we have control over animations and handler callbacks which makes the screenshots extremely deterministic and reliable for catching regressions in continuous integration.
We also provide utilities for using screenshot tests during the development process. With these scripts you can iterate on a view or layout and quickly see how the view renders in a real Android environment, without having to build the whole app. You can also render the view in multiple configurations at one go.
Documentation
Take a look at the documentation at http://facebook.github.io/screenshot-tests-for-android/#getting-started
Requirements
screenshot-tests-for-android is known to work with MacOS or Linux.
The host tooling probably doesn't work on Windows, but can be made to work with a little effort. We'll happily accept pull requests!
You need python-2.7 for the gradle plugin to work, and we also recommending installing the python-pillow library which is required for recording and verifying screenshots.
Building screenshot-tests-for-android
You don't have to build screenshot-tests-for-android from scratch if you don't plan to contribute. All artifacts are available from Maven Central.
If you plan to contribute, this is the code is broken up into two parts:
-
The
core
library is packaged as part of your instrumentation tests and generates screenshots on the device. -
The
plugin
library adds Gradle tasks to make it easier to work with screenshot tests.
In addition you'll find python code inside plugin/src/py
. This code is packaged into the gradle plugin.
We have tests for the python code and the core library. Run these commands to run all the tests:
$ gradle :plugin:pyTests
$ gradle :core:connectedAndroidTest
Both need a running emulator.
Python tests rely on the mock
and Pillow
libraries. Both can be installed via pip install mock
and pip install Pillow
.
You can install all the artifacts to your local maven repository using
$ gradle installAll
Running With a Remote Service
For usage with a remote testing service (e.g. Google Cloud Test Lab) where ADB is not available directly the plugin supports a "disconnected" workflow. Collect all screenshots artifacts into a single directory and run the plugin in "local mode" using the pullScreenshotsFromDirectory task
Example
The location of the screenshot artifacts can be configured in the project's build.gradle:
screenshots {
// Points to the directory containing all the files pulled from a device
referenceDir = path/to/artifacts
// Your app's application id
targetPackage = "your.application.package"
}
Then, screenshots may be verified by executing the following:
$ gradle verifyMode pullScreenshotsFromDirectory
To record, simply change verifyMode
to recordMode
and the local screenshots will become the master copy
Join the screenshot-tests-for-android community
- Website: http://facebook.github.io/screenshot-tests-for-android
- Discussion group: https://groups.google.com/forum/#!forum/screenshot-tests-for-android
[email protected]
See the CONTRIBUTING file for how to help out.
Authors
screenshot-tests-for-android has been written by Arnold Noronha ( [email protected]) You can reach him at @tdrhq on GitHub.
License
screenshot-tests-for-android is BSD-licensed. We also provide an additional patent grant.