How to write Unit Test cases for AVPlayer?

We are using AVPlayer and playing DRM Protected content using fairplay approach.

Now it's time for writing Unit Test cases for the player. I know how to write unit test cases to check API calls, functionality check etc.

But I'm not able to figure out what are the test cases I can write for AVPlayer to check the player functionality, content quality, audio and video output checks.

I would like to know is it possible to write Unit test cases for a Player ? if yes, what will be the better way of doing it ??