Here’s a couple of test labels that were created with Pirate Ship, which you can use to verify that your printer is working correctly:
One 2x7" label, used for Dymo 450 / Brother QL-800 printers: Download the PDF file here
Two 4x6” labels in a letter-size 8.5x11” paper, used for regular desktop printers: Download the PDF file here
One 4x6" label on a letter-size 8.5x11" paper: Download the PDF file here
One 4x6” label, used for label printers: Download the PDF file here