public static function setUpBeforeClass()
 {
     ob_start();
     // create instance of WPSEO_Twitter class
     self::$class_instance = new WPSEO_Twitter();
     // clean output which was outputted by WPSEO_Twitter constructor
     ob_end_clean();
 }
 public static function setUpBeforeClass()
 {
     ob_start();
     // create instance of WPSEO_Twitter class
     require 'framework/class-expose-wpseo-twitter.php';
     self::$class_instance = new Expose_WPSEO_Twitter();
     WPSEO_Frontend::get_instance()->reset();
     // clean output which was outputted by WPSEO_Twitter constructor
     ob_end_clean();
 }