Ronbun for testing
How common is it for your tests to include essay requirements for a test, at what rank, and what kinds of questions do you get?
My organization has both Aikikai and Yonshinkan style dojo and they include ronbun starting at least at the shodan level. Many different topics ranging from "Shinken Shobu" and its relation to your personal training to "Aikido History and Future."
We also have written tests for the mudansha...starting off with T/F, A, B, C choice-type questions, then getting into fill in the blank type questions around 3rd-1st kyu.