The test server was opened after launch when they tried to fix zone crossing lag. Then it was opened again when they were trying to figure out what causes server crashes, and asked us to log in and out repeatedly. Now its opened for combat testing.
I'm not saying that it won't stay opened now. This is something only the devs knows. I'm just informing keithb8 about the risk he takes if he relies on the test server. He can take it but can't complain later on if they take the test server offline.