public function testGetParamValue()
 {
     $factory = new InnerSessionFactory();
     $session = $factory->getInstance();
     $_SESSION['test'] = 'getParamValue';
     $this->assertEquals($session->getParamValue('test'), 'getParamValue');
     $this->assertEquals($session->getParamValue('none'), NULL);
     $_SESSION = NULL;
     $this->assertEquals($session->getParamValue('none'), NULL);
 }
 public function getInstance()
 {
     if (is_null(self::$Instance)) {
         self::$Instance = new InnerSession();
     }
     return self::$Instance;
 }