"To test the servers" means to check and assess the performance, functionality, and reliability of computer servers by conducting a series of examinations and experiments. Full definition
The changes are coming soon to the game's public test server on PC, but there's no word yet on when console players can expect it to arrive. (techtimes.com)
So many companies have created test servers for their games to help them test updates before a wider release. (thesixthaxis.com)
The good news for the beta is that it is a worldwide test in order to stress test the servers, and you will be able to play with anyone in the world. (coin-drop.com)