public async Task ShouldCompareTwoContextWithSimpleContent()
        {
            using (SampleContext expectedContext = GetSimpleTestContext())
            {
                using (SampleContext appContext = new XmlFileContext <SampleContext>(this.GetType()).Empty())
                {
                    appContext.Authors.Add(new Author()
                    {
                        FirstName = "Cedric123"
                    });
                    appContext.SaveChanges();

                    //compare context
                    var comparisonResult = await appContext.CompareTo(expectedContext);

                    string s = await appContext.AsXmlAsync();

                    string s2 = await expectedContext.AsXmlAsync(ContextDataEnum.All);

                    comparisonResult.AreEqual.ShouldBe(false, comparisonResult.ToString());
                    comparisonResult.Differences.Count.ShouldBe(2);
                    comparisonResult.Differences[0].ToString()
                    .ShouldBe("Author.FirstName Should be [Cedric] but was [Cedric123] - object with AUT_ID : 1");
                }
            }
        }
        public async Task ShouldCompareTwoContextWithSimpleContent()
        {
            using (SampleContext expectedContext = GetSimpleTestContext())
            {
                using (SampleContext appContext = new XmlFileContext<SampleContext>(this.GetType()).Empty())
                {
                    appContext.Authors.Add(new Author() {  FirstName = "Cedric123" });
                    appContext.SaveChanges();
                   
                    //compare context
                    var comparisonResult = await appContext.CompareTo(expectedContext);

                    string s = await appContext.AsXmlAsync();
                    string s2 = await expectedContext.AsXmlAsync(ContextDataEnum.All);

                    comparisonResult.AreEqual.ShouldBe(false, comparisonResult.ToString());
                    comparisonResult.Differences.Count.ShouldBe(2);
                    comparisonResult.Differences[0].ToString()
                        .ShouldBe("Author.FirstName Should be [Cedric] but was [Cedric123] - object with AUT_ID : 1");

                }
            }
        }