Add missing test coverage for edition ordering
Add missing test coverage for edition ordering

These ordering scopes fallback to ordering by document_id to prevent
editions jumping around when they are re-editioned with minor changes.
See https://github.com/alphagov/whitehall/commit/b2abdff5

askl56/whitehall,ggoral/whitehall,hotvulcan/whitehall,robinwhittleton/whitehall,hotvulcan/whitehall,robinwhittleton/whitehall,askl56/whitehall,YOTOV-LIMITED/whitehall,alphagov/whitehall,robinwhittleton/whitehall,YOTOV-LIMITED/whitehall,alphagov/whitehall,YOTOV-LIMITED/whitehall,askl56/whitehall,alphagov/whitehall,YOTOV-LIMITED/whitehall,ggoral/whitehall,ggoral/whitehall,alphagov/whitehall,robinwhittleton/whitehall,hotvulcan/whitehall,hotvulcan/whitehall,ggoral/whitehall,askl56/whitehall