Author: Stuart Herbert (stuherbert@ganbarodigital.com)
 /**
  * make sure that the hostId is a string
  *
  * @param  mixed $hostId
  *         the hostId to check
  * @return void
  */
 protected function validateMustBeString($hostId)
 {
     // make sure 'hostId' is a string
     if (!is_string($hostId)) {
         throw new E4xx_IllegalHostId($this->group->getTestEnvironmentName(), $this->group->getGroupId(), $hostId);
     }
 }
 /**
  * what is the name of the test environment that we belong to?
  *
  * @return string
  */
 public function getTestEnvironmentName()
 {
     return $this->parentGroup->getTestEnvironmentName();
 }