How to unit test a MonoBehaviour which has RequireComponent attribute ?

 using UnityEngine;
 
 [RequireComponent(typeof(Rigidbody), typeof(Collider))]
 public class ClassToTest : MonoBehaviour {
     public bool TestFunction() { return false; }
 }

 using NUnit.Framework;
 using UnityEngine;
 
 namespace Tests.Editor
 {
     public class ClassTesterEditMode
     {
         private ClassToTest _classToTest;
 
         public ClassTesterEditMode()
         {
             GameObject gameObject = new GameObject();
             _classToTest = gameObject.AddComponent<ClassToTest>();
         }
 
 
         [Test]
         public void TestOne()
         {
             Assert.False(_classToTest.TestFunction());
         }
     }
 }

When I remove the RequireComponent attribute, I won't get System.NullReferenceException : Object reference not set to an instance

How can I keep the RequireComponent attribute and bypass the nullreference error?

(by the way, I know I haven't used good names, since I wanted to keep it simple and get the message across)

I really appreciate any help you can provide.