Answer

+1
Also you can get banned for trying to spam the test server code even if it were a joke.

Test server codes are exclusive to the official testers of tanki , normal players like us don't have the code and we can only play when there is a need for mass-testing

Only official testers have the code , usually the test server is open to players.

PINNED
Hello,
You can only use the test server when there is a need for mass-testing. Only official testers have the code for entering the TO test server.
Sincerely, NedFighter
You can only use the test server when there is a need for mass-testing. Only official testers have the code for entering the TO test server.
Sincerely, NedFighter
Customer support service by UserEcho
You can only use the test server when there is a need for mass-testing. Only official testers have the code for entering the TO test server.
Sincerely, NedFighter