fn test_save() {
        let mut snapshot = Snapshot::new(Path::new("/tmp/snap.fcs")).unwrap();
        let p = Test_v1 {
            field1: 10,
            field2: "Andrei".to_owned(),
            field3: vec![1; 3],
        };

        println!("Saving struct as {:?}", &p);

        snapshot.store_object("test_object".to_owned(), 1, &p);
        snapshot.save(1, "Testing".to_owned()).unwrap();

        snapshot = Snapshot::load(Path::new("/tmp/snap.fcs")).unwrap();
        let x: Test_v3 = snapshot.restore_object("test_object".to_owned());
        let y: Test_v2 = snapshot.restore_object("test_object".to_owned());
        let z: Test_v1 = snapshot.restore_object("test_object".to_owned());

        println!("Restore as {:?}", x);
        println!("Restore as {:?}", y);
        println!("Restore as {:?}", z);

        assert!(false);
    }