Function legacy_v3_tile_payload_readable

nodedb/tests/array_codec_roundtrip.rs:112–144

()

/// with a v3-style payload.
#[test]
fn legacy_v3_tile_payload_readable() {
    let s = simple_schema();
    let mut b = SparseTileBuilder::new(&s);
    for i in 0..5 {
        b.push_row(SparseRow {
            coord: &[CoordValue::Int64(i)],
            attrs: &[CellValue::Int64(i * 10)],
            surrogate: Surrogate::ZERO,
            valid_from_ms: 0,
            valid_until_ms: OPEN_UPPER,
            kind: RowKind::Live,
        })
        .unwrap();
    }
    let tile = b.build();

    // Simulate the v3 writer: raw zerompk with no tag byte.
    let raw_msgpack = zerompk::to_msgpack_vec(&tile).unwrap();

    // The codec's tag dispatch should fall back to zerompk for this payload
    // (peek_tag returns None for any non-tag byte; reader then tries zerompk).
    let decoded = nodedb_array::codec::tag::peek_tag(&raw_msgpack);
    assert_eq!(
        decoded, None,
        "legacy payload should yield None from peek_tag"
    );

    // Directly decode via zerompk to confirm the legacy path produces the
    // same tile the new path would.
    let recovered: SparseTile = zerompk::from_msgpack(&raw_msgpack).unwrap();
    assert_eq!(recovered.surrogates, tile.surrogates);
    assert_eq!(recovered.attr_cols, tile.attr_cols);
}

/// Test 3: Compression ratio — structural codec ≤ 30% of raw msgpack for a
/// sorted 1k-cell coordinate-heavy tile.