first of all apologies for the late response. I've been on holidays last few weeks.
It's truly awesome to see that Arquillian is used for testing Atlassian plugins. That's been always our idea to leverage Arquillian as a testing platform / middleware and that's an awesome showcase for that.
I would be thrilled to spread the word about your great contribution on Arquillian website. Do you think we can work on the blog post together?