New registration system: What is test mode?
Test mode in registration allows you to check if everything is ok with your registration form and payments you've configured before you open it live for everyone. You can register as a delegate and test your registration form. While you're in test mode you can change and update all the settings in your registration.
Once you decide to go live and open registration for everyone all test data will be removed from the system and you will get a clean view into new registrations as they come in.