If you are the owner or administrator of an application that uses Yale Shibboleth for user logins, and a Shibboleth change or update is scheduled, you can test your application after the Shibboleth changes have been moved to Pre-Production and before the Shibboleth change moves to final Production. This document explains how to do it.
The process is fairly simple, but it involves making a temporary administrative change to a laptop or desktop computer under your control. You add one line to a system file, test, and then restore the original version of the file. It doesn't matter what computer you use, so if you don't like doing this on your important machine, find something that boots up at all and run the test there.