/**
  * Test getSkillLevelsForTrigger
  *
  * @param
  * @return
  */
 function testLevels()
 {
     global $tpl, $lng, $ilCtrl, $ilTabs;
     $this->setTestSubTabs("levels");
     $ilTabs->activateTab("test");
     include_once "./Services/Skill/classes/class.ilBasicSkill.php";
     include_once "Services/Form/classes/class.ilPropertyFormGUI.php";
     $this->form = new ilPropertyFormGUI();
     $this->form->addCommandButton("testLevels", $lng->txt("execute"));
     $this->form->setTitle("getTriggerOfAllCertificates()");
     $this->form->setFormAction($ilCtrl->getFormAction($this));
     // user id
     $ti = new ilTextInputGUI("Ref ID", "ref_id");
     $ti->setMaxLength(200);
     $ti->setValue($_POST["ref_id"]);
     $this->form->addItem($ti);
     $result = "";
     if (isset($_POST["ref_id"])) {
         $result = ilBasicSkill::getSkillLevelsForTrigger($_POST["ref_id"]);
         $result = "<br />Result:<br />" . var_export($result, true);
     }
     $tpl->setContent($this->form->getHTML() . $result);
 }