AutoMapperSpecificTests.cs

using System;
using AutoMapper;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace AutoMapperSpecificTests
{
        public class FirstClass
    {
        public Guid? SomeGuidProperty { get; set; }
        public Guid? SomeAloneProperty { get; set; }
        public int OtherProperty { get; set; }
    }

    public class SecondClass
    {
        public Guid SomeGuidProperty { get; set; }
        public int OtherProperty { get; set; }
    }

    [TestClass]
    public class AutoMapperGuidTests
    {
        //[AssemblyInitialize]
        //public static void TestInit(TestContext context)
        //{
           
        //}

        [TestMethod]
        public void FromGivenGuidToNullableGuid()
        {
            // Arrange
            var s = new SecondClass { SomeGuidProperty = Guid.NewGuid() };

            // Act
            var f = Mapper.Map<FirstClass>(s);

            // Assert
            Assert.AreEqual(s.SomeGuidProperty, f.SomeGuidProperty);
        }


        [TestMethod]
        public void FromMissingGuidToEmptyGuid()
        {
            // Arrange
            var s = new SecondClass { OtherProperty = 33 };

            // Act
            var f = Mapper.Map<FirstClass>(s);

            // Assert
            Assert.AreEqual(f.SomeGuidProperty, Guid.Empty);
        }

        [TestMethod]
        public void DestinationMisssingGuidIsInitalizedAsNull()
        {
            // Arrange
            var s = new SecondClass { OtherProperty = 33 };

            // Act
            var f = Mapper.Map<FirstClass>(s);

            // Assert
            Assert.AreEqual(null,f.SomeAloneProperty);
        }
    }
}