fn query_nested_cgroup()

in below/model/src/cgroup.rs [614:670]

• 53 lines of code
• 2 McCabe index (conditional complexity)

    fn query_nested_cgroup() {
        let model_json = r#"
        {
            "data": { "name": "<root>", "full_path": "", "depth": 0 },
            "count": 4,
            "recreate_flag": false,
            "children": [
                {
                    "data": { "name": "system.slice", "full_path": "/system.slice", "depth": 1 },
                    "count": 2,
                    "recreate_flag": false,
                    "children": [
                        {
                            "data": { "name": "foo.service", "full_path": "/system.slice/foo.service", "depth": 2 },
                            "count": 1,
                            "recreate_flag": false,
                            "children": []
                        }
                    ]
                },
                {
                    "data": { "name": ".hidden.slice", "full_path": "/.hidden.slice", "depth": 1 },
                    "count": 1,
                    "recreate_flag": false,
                    "children": []
                }
            ]
        }
        "#;
        let model: CgroupModel =
            serde_json::from_str(model_json).expect("Failed to deserialize cgroup model JSON");
        for (field_id, expected) in &[
            // "path:" omitted falls back to querying self (root)
            ("full_path", Some("")),
            // Ignore consecutive slashes
            ("path:///////.name", Some("<root>")),
            ("path:/system.slice/.full_path", Some("/system.slice")),
            (
                "path:/system.slice/foo.service/.full_path",
                Some("/system.slice/foo.service"),
            ),
            // Allow path param to contain "/."
            ("path:/.hidden.slice/.full_path", Some("/.hidden.slice")),
            // Non-existent cgroups
            ("path:/no_such.slice/.full_path", None),
            ("path:/system.slice/no_such.service/.full_path", None),
        ] {
            assert_eq!(
                model.query(
                    &CgroupModelFieldId::from_str(field_id)
                        .map_err(|e| format!("Failed to parse field id {}: {:?}", field_id, e))
                        .unwrap()
                ),
                expected.map(|s| Field::Str(s.to_string()))
            );
        }
    }