/// Verifies that resolution works correctly for chains with 2 links

    /// (even-length), e.g. `HEAD → MAIN → refs/heads/master`.

    #[test]

    fn resolve_two_hop_chain() {

        let symrefs = serde_json::from_value::<SymbolicRefs>(serde_json::json!({

            "MAIN": "refs/heads/master",

            "HEAD": "MAIN",

        }))

        .unwrap();

        // HEAD → MAIN → refs/heads/master should resolve to refs/heads/master

        assert_eq!(

            symrefs.resolve_head().map(|r| r.as_str()),

            Some("refs/heads/master"),

        );

    }