You can use Address Only labels for testing in Shiptheory, this could be for new shipping rules or other changes that need testing.
You can enable Address Only labels on the Manage Carriers page.
For more information regarding address only labels; follow the guide here.
An easy way to bring an order through Address Only is to create it manually using test customer details;
The manual shipment page can be found here.
Make sure to select "Address Only Labels" as the courier:
If you have any questions or issues with this, you can contact support.