/**
  * @return Pojo_Accessibility
  */
 public static function instance()
 {
     if (is_null(self::$_instance)) {
         self::$_instance = new self();
     }
     return self::$_instance;
 }
 public function test_getInstance()
 {
     $this->assertInstanceOf('Pojo_Accessibility', Pojo_Accessibility::instance());
 }