I rarely see professional online testing that is this sophisticated, thorough or accurate. Especially the big publishing house quizzing services.
It's easy to come up with a couple-dozen good questions (especially if you're rephrasing someone elses work!) and answer sets. Coming up with the problem sets for a whole textbook, or even transcribing the questions/answers from the text to an online quiz system, would be a daunting task. (I remember college: "the answers to odd-number problems are in the back. Not all of them are correct.")
But thanks! I've been through several "Pro" MOOCs now, and way too many "Facebook Quizzes", and I'm developing some definite opinions about how to do online quizzes (and how NOT to.)