I'm having a bit of a problem now resolving my Identity bean when working in a JSFUnit test.
What I believe should work is:
server.getManagedBeanValue("#{identity}")
server.getManagedBeanValue("#{sessionScope['org.jboss.seam.security.identity']}")
I should search a little harder before posting.
I just found the post that says that this will be addressed in beta 2.
So....sorry I brought it up :)