JiraRestApi\Issue\IssueService::getTimeTracking PHP Метод

    public function getTimeTracking($issueIdOrKey)
    {
        $ret = $this->exec($this->uri . "/{$issueIdOrKey}", null);
        $this->log->addDebug("getTimeTracking res={$ret}\n");
        $issue = $this->json_mapper->map(json_decode($ret), new Issue());
        return $issue->fields->timeTracking;
    }

 public function testGetTimeTracking()
 {
     try {
         $issueService = new IssueService();
         $ret = $issueService->getTimeTracking($this->issueKey);
         var_dump($ret);
     } catch (JIRAException $e) {
         $this->assertTrue(false, 'testGetTimeTracking Failed : ' . $e->getMessage());
     }
 }