public function get_environment_size($include_extensions = true)
 {
     $estimated_size = parent::get_environment_size();
     if ($include_extensions) {
         $extends = $this->get_test_extension();
         if (!empty($extends)) {
             $test_profile = new pts_test_profile($extends);
             $estimated_size += $test_profile->get_environment_size(true);
         }
     }
     return $estimated_size;
 }