Deleting a test or practice space is no longer the end of it. For seven days after it's gone, you can bring it back — together with everyone it was shared with, and, for a test, the sessions you'd already collected.
Everything removed in the last week shows up under Account → Recently deleted, in the Advanced section, with who deleted it and when. Restore puts an item back where it was, or at the top level if its folder is gone too.
Recently deleted is part of our plan for organizations, for admins and owners. After the seven days, deleted items are kept for a retention period your workspace sets under Account → Security & compliance, then permanently removed.