Unit tests for Android layout code: what conditions to test?

I would like to write unit tests for some fairly complex Android layout code (multi-level nested layouts, RtL vs LtR, dynamic layout changes as data items are moved around in a tree).

What I'd like to avoid is comparing screenshots of layouts with reference images.

What more abstract conditions might be good targets for tests?

I realize this is a fairly unspecific question, but I am not looking for specific code, more hoping for general suggestions from people who've done this kind of thing.