orage.insert({
						roomId,
						sortKey: sortKey.buffer(),
						message: `message ${i} before gap`
					});
					sortKey = sortKey.previousKey();
				}
				sortKey = sortKey.nextKeyWithGap();
				await storage.insert({
					roomId,
					sortKey: sortKey.buffer(),
					message: `event to represent gap!`
				});
				for (var i = 1; i <= 10; i++) {
					sortKey = sortKey.nextKey();
					await storage.insert({
						roomId,
						sortKey: sortKey.buffer(),
						message: `message ${i} after gap`
					});
		