Everything looks great. I don't love this test. It's good for proving that the new way works, but it feels like "don't use these things that don't exist anymore", and you could end up creating one of these tests for every use of a player method by every component. I can't think of a better way to cover this though except maybe to state that we're moving to use externs instead of exports permanently now, so this shouldn't be an issue unless we change our minds on that?

Also, you might be able to simplify this to:

```
ok(player.requestFullScreen === player['requestFullScreen']);
player.requestFullScreen = false;
ok(player.requestFullScreen === player['requestFullScreen']);
```
Basically making sure that the non-string version is never minified, because then the fullscreen toggle wouldn't have a minified version available to it. At least I think that would cover it.