Why is parenting not working?

Hi, i have 2 cubes Test1 an Test2 and the Script is attached to Test2 but nothing happens. I tried so many things from the Forum but nothing worked for me, hope someone can help me with that.

 using UnityEngine;
 using System.Collections;
 
 public class ExampleClass : MonoBehaviour
 {
     void start()
     {
         GameObject test = GameObject.Find("Test1");
         this.transform.parent = test.transform;
     }
 }