+reset_state();
+$item = get_item(5); $item->add_to_list(position => 'after', reference => 3);
+test_positions "add_to_list without prior remove_from_list", [ 1, undef, 1 ], [ 2, undef, 2 ], [ 3, 1, 1 ], [ 5, 1, 2 ], [ 4, 1, 3 ], [ 6, 4, 1 ], [ 7, 4, 2 ], [ 8, 2, 1 ];
+