Function checkpoint_roundtrip_with_buffer

nodedb-graph/src/csr/persist.rs:354–363

()

    #[test]
    fn checkpoint_roundtrip_with_buffer() {
        let mut csr = CsrIndex::new();
        csr.add_edge("a", "L", "b").unwrap();
        // Don't compact — edges in buffer.
        let bytes = csr.checkpoint_to_bytes().expect("no governor, cannot fail");
        let restored = CsrIndex::from_checkpoint(&bytes)
            .expect("roundtrip")
            .unwrap();
        assert_eq!(restored.edge_count(), 1);
    }

    #[test]
    fn golden_header_layout() {