Moq extension methods

MoqExtensions.cs

using System;
    using System.Collections;
    using System.Threading.Tasks;
    using Moq.Language;
    using Moq.Language.Flow;

    public static class MoqExtensions
    {
        //see: http://haacked.com/archive/2010/11/24/moq-sequences-revisited.aspx/
        public static void ReturnsInOrder<T, TResult>(this ISetup<T, TResult> setup, params object[] results)
            where T : class
        {
            var queue = new Queue(results);
            setup.Returns(() =>
            {
                var result = queue.Dequeue();
                if (result is Exception)
                {
                    throw result as Exception;
                }

                return (TResult)result;
            });
        }

        public static void ReturnsInOrderAsync<T, TResult>(this ISetup<T, Task<TResult>> setup, params object[] results)
            where T : class
        {
            var queue = new Queue(results);
            setup.Returns(async () =>
            {
                var result = queue.Dequeue();
                if (result is Exception)
                {
                    throw result as Exception;
                }

                await Task.Yield();
                return (TResult)result;
            });
        }

        public static IReturnsResult<TMock> ReturnsYieldAsync<TMock, TResult>(this IReturns<TMock, Task<TResult>> mock, TResult value) where TMock : class
        {
            return mock.Returns(async () =>
            {
                await Task.Yield();
                return value;
            });
        }
    }