Sure. Disclaimer, Tivi has very few UI tests, but I have written a load of UI tests for various libraries:

1) I don’t calculate test coverage so can’t comment. I should try this out though.

2) No changes, everything still runs as instrumentation tests.

3) I don’t use Robolectric for UI tests so can’t comment.

4) Jose Alcérreca is probably a better person to answer this :)