Fix StarRating test broken during migration to Observable.
Fix StarRating test broken during migration to Observable.

tkrugg/deliteful,cjolif/deliteful,kitsonk/deliteful,EAlexRojas/deliteful,EAlexRojas/deliteful,harbalk/deliteful,brunano21/deliteful,brunano21/deliteful,harbalk/deliteful,kitsonk/deliteful,cjolif/deliteful,tkrugg/deliteful