What this checks
This page makes a test key on this device, locks it with a PIN, opens it again, and signs with it. It talks only to the key service on this box. It uses testnet and a test email, and nothing here touches money.
1. Set up a test key
Pick any 6-digit PIN for the test. Not one digit repeated, not a run like 123456.
2. Open it with the PIN
3. A wrong PIN is refused
Sends one wrong PIN. You should see "That PIN is not right" and how many tries are left. Five wrong in a row lock it for 15 minutes.