SkippingFrameTests.cs

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

namespace PlayModeTests_9s
{
    public class SkippingFrameTests
    {
        private GameObject PrepareCube()
        {
            var go = GameObject.CreatePrimitive(PrimitiveType.Cube);
            var rb = go.AddComponent<MovementScript>();
            rb.velocity = Vector3.down * 5;
            return go;
        }
        
        [UnityTest]
        public IEnumerator CubeMovesDown()
        {
            var cubeUnderTest = PrepareCube();
            var initialPosition = cubeUnderTest.transform.position;

            yield return null;

            Assert.That(cubeUnderTest.transform.position, Is.Not.EqualTo(initialPosition));
        }
    }
}