/**
  * test updating a Unit of Measure that does not exist
  *
  * @expectedException PDOException
  **/
 public function testUpdateInvalidUnitOfMeasure()
 {
     // create a Unit of Measure and try to update it without actually inserting it
     $unitOfMeasure = new UnitOfMeasure(null, $this->VALID_unitCode, $this->VALID_quantity);
     $unitOfMeasure->update($this->getPDO());
 }