How do I know if I can play real music on Android?

Question

I want to test the music app with automation. However, there is no way to verify that the music actually plays. I created an app using the audio focus. I think the audio focus is not related to real play back. Because if it doesn't play, audio focus can hold onto the focus.

So, I want to create an app to confirm playback. What should I do?

Answer 1

Make the test app listen to the microphone. Play some special signal (a sweep or a click of some sort) that can be easily distinguished from the noise in the recorded signal.