This can be easy or tough, depending on who they focus. Many teams will go for the Warlock (they should in fact go for the Warrior). If they do, its quite simple - treat it the same way as Discipline Priest/Rogue. Your Warrior gets on the Rogue and prevents him getting to the Warlock while your Warlock controls their Rogue and DoTs everything.

With the Warrior's help kiting, their Rogue should die much quicker than your Warlock. The dangerous part is if it takes too long for the Rogue to die, the Warlocks DoTs can really wreck you to a point where he can 2v1 with ease, so try to keep it swift and keep DoTs up on the Warlock at all times.

If they focus the Warrior, you must tank it up fairly soon. The Warlock has to ensure he doesn't get CC'd- Spell Lock/LOS Fears, save your trinket for Blind. Start out by fearing the Rogue ASAP. Then get full DoTs on everything. Your Warrior should DPS their Warlock while the Rogue is feared and switch back to the Rogue when he's not. The combination of your Warrior's DPS on the Lock and your DoTs on everything can turn the tide. However its still a rough match if they play it correctly.