Lately we have been incorporating select2-rails into our applications.  I cannot say enough how much I love this tool and its ease of use.

That being said, we had had issues with testing and select2-rails.  So Steve Tong of Rebel-Outpost spent some time and found a small script to use for testing it.

https://gist.github.com/4339329

The only issue with this is that you can only have one option in the select2.

If anybody finds a better way, please let us know.