This test project comes with all the required Android Testing Support Library dependencies in the Gradle file. Tests are under the app/src/androidTest folder.

Note that before running your tests, you might want to turn off animations on your test device. It's a known issue that leaving system animations turned on in a test device (window animation scale, transition animation scale, animator duration scale) might cause unexpected results, or may lead tests to fail.

To create a new run configuration:

Click on Run -> Edit Configurations...
Click on the plus sign and then on "Android Tests"
Give a name to the configuration, e.g. TestAppTests
Choose the MapboxGLAndroidSDKTestApp module
Choose android.support.test.runner.AndroidJUnitRunner as the instrumentation runner
Click OK to save the new configuration

You can now run this configuration from the main toolbar dropdown menu.

Running Espresso tests on AWS Device Farm

On a terminal, within mapbox-gl-native/android/java, run the tests (cC stands for connectedCheck):

$ ./gradlew cC -p MapboxGLAndroidSDKTestApp

Then:

Go to your AWS Console and choose Device Farm.
Create a new project, e.g. MapboxGLAndroidSDKTestApp
On step 1, upload the APK in mapbox-gl-native/android/java/MapboxGLAndroidSDKTestApp/build/outputs/apk/MapboxGLAndroidSDKTestApp-debug-unaligned.apk
On step 2, choose Instrumentation, test filter is com.mapbox.mapboxgl.testapp.MainActivityTest and upload the APK in mapbox-gl-native/android/java/MapboxGLAndroidSDKTestApp/build/outputs/apk/MapboxGLAndroidSDKTestApp-debug-androidTest-unaligned.apk
On step 3, choose a device pool. E.g. Top Devices
On step 4, customize your device state (if needed)
Finally, confirm the configuration and run the tests.

If you have no tests for your app, or want to test some random user behaviour, you can just choose "Built-in: Fuzz" in step 2.

Running the UI/Application Exerciser Monkey

Similar to the "Built-in: Fuzz" test mentioned above, Android provides Monkey, "a program that runs on your emulator or device and generates pseudo-random streams of user events such as clicks, touches, or gestures, as well as a number of system-level events."

To exercise Monkey on the test app, install the package on the device (e.g. via Android Studio) and then:

$ adb shell monkey -p com.mapbox.mapboxgl.testapp -v 500