Version: 2017.2
public static void IsNull (T value);
public static void IsNull (T value, string message);

Description

Asserts that the value is null.

using UnityEngine;
using UnityEngine.Assertions;

public class AssertionExampleClass : MonoBehaviour { MyClass myClassReference; void Update() { //Make sure the myClassReference reference is never set Assert.IsNull(myClassReference); } }

public class MyClass {}