Found this website from the Socionics subreddit.
Socionics Type and Cognitive Functions Test (sociotype.xyz)
There's actually two tests and two tools used to compared types. A lot of it is based on Small Groups, but it also measures the Information Elements as well.
After you've gotten your results, you can hover your cursor over the little icons beside the terms to see what exactly they mean. Note that some terms don't have all their definitions elaborated on yet.
I think most, if not all, definitions are drawn from the ones compiled in this file.
Small_Groups.pdf (amazonaws.com)
I'm interested to see what people think.