@Test
 public void location_area_id_can_be_set_and_retrieved() {
   Location l = new Location("", "", null, null);
   l.setAreaID("area id");
   assertEquals("area id", l.areaID());
 }
 @Test
 public void location_area_id_is_blank_on_construction() {
   Location l = new Location("", "", null, null);
   assertEquals("", l.areaID());
 }