What's involved in testing Object Container Streaming? What kind of things are you working with and looking at?

So we're a bit involved in entities dropping in and out. It's a lot of traveling around, but it's also finding all the different entities, how we can spawn them, move them, change the state for one player without changing it for another, bringing the players back together, and checking the states of everything match up. And we're looking for all the edge cases as well at the moment. Because everything's fine apart from stalling when you start loading up, say, Levski. There's a stall as it brings Levski in. Sorry, I'm losing my train of thought.