/**
  *test updating a Trail Relationship that does not exist
  *
  * @expectedException UnexpectedValueException
  **/
 public function testUpdateInvalidTrailRelationship()
 {
     // create a Trail Relationship and try to update it without actually inserting it
     $trailRelationship = new TrailRelationship($this->VALID_SEGMENTID, $this->VALID_TRAILID, $this->VALID_SEGMENTTYPE);
     $trailRelationship->update($this->getPDO());
 }