public function testIsValidSessionInvalidUsername()
{
$app = $this->getApp();
$userEntity = new Entity\Users();
$tokenEntity = new Entity\Authtoken();
$userEntity->setUsername(null);
$tokenEntity->setSalt('vinagre');
$token = new Token($userEntity, $tokenEntity);
$app['session']->start();
$app['session']->set('authentication', $token);
$accessControl = $this->getAccessControl();
$this->assertInstanceOf('Bolt\\AccessControl\\AccessChecker', $accessControl);
$response = $accessControl->isValidSession($token);
$this->assertFalse($response);
}