Running gradle's connectedAndroidTest on a specific device

Question

How do you run connectedAndroidTest on a particular device?

I would expect something like:

./gradlew connectedAndroidTest -DconnectedAnd         


        

Answer 1

I created an "hack" to be able to do it.. put this block in the android section of your build.gradle, and then you have to set the ANDROID_HOME env variable to the sdk folder, and the UNIT_TESTS_DEVICE_ID env variable with the serial number of the device on which you want to run tests on.

deviceProvider(new com.android.builder.testing.ConnectedDeviceProvider(file(System.getenv("ANDROID_HOME") + File.separator + "platform-tools" + File.separator + "adb")) {
    public String getName() {
        return "singleDevice"
    }

    public List getDevices() {
        List devices = super.devices;
        List toReturn = new ArrayList<>();
        String deviceSerialNum = System.getenv("UNIT_TESTS_DEVICE_ID");
        devices.each {
            if (it.getSerialNumber().equals(deviceSerialNum)) toReturn.add(it);
        }
        if (toReturn.isEmpty()) {
            throw new RuntimeException("Device for unit tests not found!");
        }
        return toReturn;
    }
})

Then you use the task singleDeviceAndroidTest{Variant} to run the tests. Tested only on gradle plugin version 1.0.0.