NUnit
Basic Setup
Solution
public class Challenge
{
    public static int Add(int a, int b)
    {
        return a + b;
    }
}public class Challenge
{
    public static int Add(int a, int b)
    {
        return a + b;
    }
}Tests
using NUnit.Framework;
[TestFixture]
public class AddTest
{
    [Test, Description("should add two numbers")]
    public void ShouldAddTwoNumbers()
    {
        Assert.That(Challenge.Add(1, 2), Is.EqualTo(3), "1 + 2 should equal 3");
    }
}using NUnit.Framework;
[TestFixture]
public class AddTest
{
    [Test, Description("should add two numbers")]
    public void ShouldAddTwoNumbers()
    {
        Assert.That(Challenge.Add(1, 2), Is.EqualTo(3), "1 + 2 should equal 3");
    }
}