Version: 2019.1 (switch to 2018.3 or 2017.4)
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Assert.IsFalse

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

Parameters

condition true or false.
messageThe string used to describe the result of the Assert.

Description

Return true when the condition is false. Otherwise return 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);
    }
}

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Copyright © 2019 Unity Technologies. Publication: 2019.1-002V. Built: 2019-04-15.
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