Function cycle_detected

nodedb-cluster/src/subsystem/topo_sort.rs:207–211

()

    #[test]
    fn cycle_detected() {
        let subsystems = vec![mock("x", &["y"]), mock("y", &["x"])];
        let err = topo_sort(&subsystems).unwrap_err();
        assert!(matches!(err, TopoError::Cycle { .. }));
    }

    #[test]
    fn missing_dependency() {