Test to type your friends?

Is there an online MBTI test specifically used to figure out your friend's, coworker's, etc., personality type instead of your own? I've used the test on here, trying to myself in my friend's frame of mind. But I feel that this would produce inaccurate results, as I don't know for sure what my friend thinks or how she feels. Is there a tests that asks questions about how someone acts? I'm looking for something with questions like, "Do they go out with friends a lot" rather than "Do they like hanging out with friends?" Thanks!