类型为DateTimeOffset的模拟属性导致Windows Store测试库中的InvalidProgramException

Question

I just started out with a Windows Store application and deciced to use test-driven development in my project. Since I've had some experience with NUnit previously that was my library of choice, and then I started using MoqRT which was the mocking library recommended by a website as the mocking library to use for Windows Store applications.

The problem I am facing is when I'm mocking an object that has a DateTimeOffset as the type of the property. I receive the following exception:

System.InvalidProgramException: Common Language Runtime detected an invalid program
at Castle.Proxies.ITimeProxy_1.get_Expires()

... the rest of stacktrace removed due to clarity

Now, this only occurs when I use the DateTimeOffset type on the property, and mocking for instance a string property works perfectly fine.

using System;
using Moq;
using NUnit.Framework;

namespace StoreTesting
{
    [TestFixture]
    public class UnitTest1
    {
        [Test]
        public void TestMethod1()
        {
            // Mock
            DateTimeOffset expirydate = DateTimeOffset.UtcNow.AddSeconds(2000);

            var time = new Mock<ITime>();
            time.Setup(m => m.Expires).Returns(expirydate);

            // Act
            TimeDependant obj = new TimeDependant(time.Object);
            var result = obj.Act();

            // Assert
            Assert.That(result, Is.EqualTo(expirydate));
        }
    }

    public class TimeDependant
    {
        private readonly ITime time;

        public TimeDependant(ITime time)
        {
            this.time = time;
        }

        public DateTimeOffset Act()
        {
            return time.Expires;
        }
    }

    public interface ITime
    {
        DateTimeOffset Expires { get; }
    }
}

If I subclass ITime and use that instead of the Mock, everything is just fine as well.

When searching for this it seems as though the main problem of the exception is related to "too large methods", but seeing as this only occurs for properties of type DateTimeOffset I don't see how that can affect my test, since other properties should fail as well if it was something in regards to that.

Another thing is that I'm running the tests using the NUnit application, as the tests won't run in Visual Studio 2012 due to it being a Windows Store application (which is a whole other question). I don't know if this can affect the behaviour as well.

The question I'm asking is; Is there a way to mock interfaces with properties of type DateTimeOffset without having it throwing an exception?

Answer 1

You cannot use Moq with Windows Store Runtime as I know, because winrt doesn't allow dynamic codegen .

I do it just thought creating simple .NET Framework library, which reference all my code, which I want to test, from Win Store Project

How to use Moq and nUnit to write Unit Tests for Windows Runtime libraries