Improve test coverage for publications index atom feed.
Improve test coverage for publications index atom feed.

Specifically provide scenarios in which there are consultations as well
as publications.

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