Test for storing and retrieving objects

VS 2010, 4.0....C# and NUnit
Hoping someone can help me out. I am trying to store and retrieve items from an interface and create Nunit tests on them and am lost. I believe the impl and interface are correct but I am having problems figuring out how to write the tests to test that the item was stored, retrieved and then compare the two to see if they are the same.

Code:

using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ReneApp.Domain
{
    using ReneApp.Service;

    using NUnit.Framework;
    [TestFixture]

    public class ItemSvcIntTest 
    {
        [Test]
        public void ValidateStoreItem()
        {
            IitemSvcInt serv1 = new ItemSvcBinaryImpl();
            serv1.StoreItem(new Item("Stock", "Dark Rival", "Masters of Time", "Brenda Joyce", "Book", "Time Travel", true));
            [URL=http://www.go4expert.com/articles/c-cpp-assert-function-t27488/]Assert[/URL].AreEqual(serv1, serv1); 
        }

        public void ValidateRetrieveItem()
        {

        }
    }
} using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using ReneApp.Domain;

namespace ReneApp.Service
{
    public class TransFactory
    {
        public IitemSvcInt GetItemSvc()
        {
            return new ItemSvcBinaryImpl();
        }
    }
} using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ReneApp.Service
{
    using ReneApp.Domain;

    public interface IitemSvcInt
    {
        void StoreItem(Item itemx);
        Item RetrieveItem();
    }
} using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters;
using System.Runtime.Serialization.Formatters.Binary;
using ReneApp.Domain;

namespace ReneApp.Service
{
    public class ItemSvcBinaryImpl : IitemSvcInt
    {
        public void StoreItem(Item itemX)
        {
            FileStream fileStream = new FileStream
            ("Item.bin", FileMode.Create, FileAccess.Write);
            IFormatter formatter = new BinaryFormatter();
            formatter.Serialize(fileStream, itemX);
            fileStream.Close();
        }

        public Item RetrieveItem()
        {
            FileStream fileStream = new FileStream
            ("Item.bin", FileMode.Open, FileAccess.Read);
            IFormatter formatter = new BinaryFormatter();
            Item itemX = formatter.Deserialize(fileStream) as Item;
            fileStream.Close();
            return itemX;
        }
    }
} using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ReneApp.Domain
{
    [Serializable]
    public class Item
    {
        private string Status;                   // Status of the item.
        private string Title;                    // Title of the item.
        private string Series;                   // Series of the item.
        private string Author;                   // Author of the item.
        private string Type;                     // Type of item.
        private string Description;              // Description of the item.   
        private bool Addition;                   // Addition of item.

        public Item() { }
        public Item(string status, string title, string series, string author, string type, string description, bool addition)
        {
            Status = status;
            Title = title;
            Series = series;
            Author = author;
            Type = type;
            Description = description;
            Addition = addition;
        }

        public string status
        {
            get { return Status; }
            set { Status = value; }
        }

        public string title
        {
            get { return Title; }
            set { Title = value; }
        }

        public string series
        {
            get { return Series; }
            set { Series = value; }
        }

        public string author
        {
            get { return Author; }
            set { Author = value; }
        }

        public string type
        {
            get { return Type; }
            set { Type = value; }
        }

        public string description
        {
            get { return Description; }
            set { Description = value; }
        }

        public bool addition
        {
            get { return Addition; }
            set { Addition = value; }
        }

        public bool ValidateItem()
        {
            if (status == null)
                return false;
            if (title == null)
                return false;
            return true;
        } 
    }

    // Declare type to process item.
    public delegate void ProcessItemDelegate(Item item);
}

Any assistance would be greatly appreciated