How to test GUI ports within their poudriere jails?

Is there a preferred way to test GUI ports function correctly within 
poudriere? Wondering if there is a workflow to do so instead of just 
creating an install on a second computer or in a virtual machine. My 
primary goal is to be able to confirm it still functions properly with 
minimal runtime dependencies as my main FreeBSD system is a desktop with 
many things installed so would contaminate that check.

Thanks,
Edward Sanford Sutton, III