public void shouldThrowExceptionWhenVersionCollisionHappens(){
deleteAndPopulateTable("items");
Item m = new Item();
m.set("item_number", 1);
m.set("item_description", "descr 2").saveIt();
m.saveIt();
Item m1 = Item.findById(1);
Item m2 = Item.findById(1);
m1.set("item_description", "descr 5").saveIt();