Rails - Any plugins for building a online quiz/test?

I'm trying to add some online tests to my site and before I rolled up my sleeves I was wondering if there is any ruby on rails plugin support for such 开发者_Python百科a task.

Essentially I'm looking for something that lets me add multiple choice questions. Performing the scoring logic would be an added bonus.

Any one know of anything?

Ryan Bates has a screencast on nested model forms where the example app is a survey tool You could use it as a starting point.