Version: 2017.3
public static void IsFalse (bool condition);
public static void IsFalse (bool condition, string message);

Description

Asserts that the condition is false.

using UnityEngine;
using UnityEngine.Assertions;

public class AssertionExampleClass : MonoBehaviour { GameObject go; void Update() { //Make sure the Game Object is never in active state Assert.IsFalse(go.activeSelf); } }