How can you know that it's "for sure" working if you don't test it?

This was indeed tested--it was just tested by logging into the actual central server and modifying things.

To set up a "test" central server, there's one-time setup (covered in the video and docs, basically setting up local_settings.py on test distributed and central servers).  After that, all you have to do is `git checkout -t origin/branch_to_test`.  It seems so simple.