GeneralThreadAffineContext with NUnit

using System.Threading.Tasks;
using FluentAssertions;
using NUnit.Framework;

// see http://nitoprograms.blogspot.ca/2012/02/async-unit-tests-part-2-right-way.html
// include CapturerAndRestorer.cs and GeneralThreadAffineContext.cs from here:
// http://www.symbolsource.org/Public/Metadata/NuGet/Project/AsyncUnitTests-MSTest/1.0.1/Release/.NETFramework,Version=v4.0,Profile=Client/Nito.AsyncEx.UnitTests.MSTest
namespace ClassLibrary1
{
    public class Calculator
    {
        public Task<int> Add(int a, int b)
        {
            return Task.FromResult(42);
        }
    }

    [TestFixture]
    public class Test
    {
        [Test]
        public void ShouldAdd()
        {
            GeneralThreadAffineContext.Run(async () =>
            {
                var c = new Calculator();
                var sum = await c.Add(1, 2);
                sum.Should().Be(3);
            });
        }
    }
}