I’m following this tutorial on how to write C# tests, https://www.youtube.com/watch?v=HYrXogLj7vg and its a great video however I can’t seem to initialize a new Reservation object as Visual Studio does not recognize the Fundamentals folder within TestNinja. Does anyone see anything wrong with this screenshot/Code?

using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using TestNinja.Fundamentals;

namespace TestNinja.UnitTests
{
    [TestClass]
    public class ReservationTests
    {
        [TestMethod]
        public void CanBeCancelledBy_UserIsAdmin_ReturnsTrue()
        {
            //Arrange
            var reservation = new Reservation();
            //Act

            //Assert

            
        }
    }
}
[enter image description here](https://i.sstatic.net/f5gRqqY6.png)

I attempted to add

using TestNinja.Fundamentals;

However it does not correctly identify that it exists.