Getting started with xUnit.net, on Platform:

• .NET Core / ASP.NET Core
• Desktop CLR
• Universal Windows Apps

using Xunit;

namespace MyFirstUnitTests
{
    public class TestClass
    {
        [Fact]
        public void PassingTest()
        {
            Assert.Equal(4, Add(2, 2));
        }

        [Fact]
        public void FailingTest()
        {
            Assert.Equal(5, Add(2, 2));
        }

        int Add(int x, int y)
        {
            return x + y;
        }
    }
}