Serializable doesnt work

Questions & Answers
1

i got this c# class on unity

using UnityEngine;
using System.Collections;
[System.Serializable]
public class test
{
    public int x;
    public int y;
}

and serializable doesnt work ¿why? i got unity 3.4

2

using UnityEngine;
using System.Collections;

[System.Serializable]
public class test
{
    public int x;
    public int y;
}

public class pruebas : MonoBehaviour {

public test myTestVar1; // This will be shown in the editor

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {

}
}