Test Database/Site

Hi, we are currently running ERPnext under a Frappe Cloud subscription for $25/month, allowing us to create private benches. I want to run a test site/database alongside our production site which we can test add-ons and play around with the system without messing up our actual site/database. Just wondering what the best option to do this would be or if we would have to purchase a whole new site under a private bench. Thanks