public function testGenerateUpgradeToken() {
     $this->simulateLogin('*****@*****.**');
     $controller = new UpgradeController(true);
     UpgradeController::generateUpgradeToken();
     $this->assertTrue( file_exists($this->token_file) );
     $this->assertPattern('/^[\da-f]{32}$/', file_get_contents($this->token_file));
 }