Function test_del_change

atomic-core/src/pristine/txn/write/tests.rs:318–364

()

    #[test]
    fn test_del_change() {
        let dir = tempdir().unwrap();
        let db_path = dir.path().join("pristine");
        let pristine = Pristine::open(&db_path).unwrap();

        let mut txn = pristine.write_txn().unwrap();

        // Create a view with 3 changes
        let mut view = txn.open_or_create_view("test").unwrap();

        let hash1 = Hash::of(b"change 1");
        let hash2 = Hash::of(b"change 2");
        let hash3 = Hash::of(b"change 3");

        let id1 = txn.register_change(&hash1).unwrap();
        let id2 = txn.register_change(&hash2).unwrap();
        let id3 = txn.register_change(&hash3).unwrap();

        txn.put_change(&mut view, id1, &hash1).unwrap();
        txn.put_change(&mut view, id2, &hash2).unwrap();
        txn.put_change(&mut view, id3, &hash3).unwrap();
        txn.update_view(&view).unwrap();

        assert_eq!(view.change_count, 3);

        // Remove the middle change (id2)
        let removed_seq = txn.del_change(&mut view, id2, &hash2).unwrap();
        assert_eq!(removed_seq, Some(1)); // Was at sequence 1

        // View should now have 2 changes
        assert_eq!(view.change_count, 2);

        // Change 1 should still be at sequence 0
        let seq0 = txn.get_change_at_seq(&view, 0).unwrap();
        assert_eq!(seq0, Some(id1));

        // Change 3 should now be at sequence 1 (shifted down)
        let seq1 = txn.get_change_at_seq(&view, 1).unwrap();
        assert_eq!(seq1, Some(id3));

        // Merkle state should be recomputed
        let expected_state = Merkle::ZERO.next(&hash1).next(&hash3);
        assert_eq!(view.state, expected_state);

        txn.update_view(&view).unwrap();
        txn.commit().unwrap();
    }

    #[test]
    fn test_del_change_not_in_view() {