How to rotate activity, I mean: screen orientation change using Espresso?

Question

I have decided that one of the testing criteria for my application tests with Google\'s Espresso is:

Test should maintain Activity state after s

Answer 1

How to rotate the screen:

public static void rotateScreen(Activity activity) {
    final CountDownLatch countDownLatch = new CountDownLatch(1);
    final int orientation = InstrumentationRegistry.getTargetContext()
            .getResources()
            .getConfiguration()
            .orientation;
    final int newOrientation = (orientation == Configuration.ORIENTATION_PORTRAIT) ?
            ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE :
            ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;

    activity.setRequestedOrientation(newOrientation);

    getInstrumentation().waitForIdle(new Runnable() {
        @Override
        public void run() {
            countDownLatch.countDown();
        }
    });

    try {
        countDownLatch.await();
    } catch (InterruptedException e) {
        throw new RuntimeException("Screen rotation failed", e);
    }
}

The Activity can be obtained from the ActivityRule.