0. Check that your sticker picker shows the same stickers as before.
1. Change a room sticker pack by adding or removing a sticker to/from it. Check that two state events are sent, one being m.room.image_pack , the other im.ponies.room_emotes .
2. Use or disuse a sticker pack in room settings. Check that two account data events are present, one being m.image_pack.rooms , the other im.ponies.emote_rooms .