Unit Test with a class extends MonoBehaviour

UnitTestWithClassExtendsMonoBehaviour

using System;
using System.Collections.Generic;
using System.Threading;
using NUnit.Framework;
using UnityEngine;

namespace UnityTest
{
    internal class Subject : MonoBehaviour
    {
        public int Add(int a, int b)
        {
            return a + b;
        }
    }
    
    internal class CalculatorTest
    {
        [Test]
        public void AddOneToOne()
        {
            var obj = new GameObject();
            obj.AddComponent<Subject>();
            var subject = obj.GetComponent<Subject>();
            
            Assert.AreEqual(2, subject.Add(1, 1), "1 + 1 should be eq to 2");
        }
    }
}