public void Test_Load_Attachments_From_DataService()
        {
            var files = new List <IFileInfo>
            {
                ContentTestHelper.CreateValidFile(0),
                ContentTestHelper.CreateValidFile(1),
                ContentTestHelper.CreateValidFile(2)
            };

            var dataService = DataServiceFactory();

            dataService.Setup(ds => ds.GetContentItem(It.IsAny <int>())).Returns(MockHelper.CreateValidContentItemReader);

            dataService.Setup(
                ds =>
                ds.GetMetaData(It.IsAny <int>())).Returns(
                () => MockHelper.CreateMetaDataReaderWithFiles(files, new IFileInfo[0], new IFileInfo[0]));

            var contentItem = Util.GetContentController().GetContentItem(Constants.CONTENT_ValidContentItemId);

            Assert.IsNotNull(contentItem);

            var serialized = contentItem.Metadata[FileController.FilesKey];

            Assert.IsNotEmpty(serialized);

            Assert.IsNotEmpty(contentItem.Files);
            Assert.AreEqual(contentItem.Files.Count, 3);
            Assert.AreEqual(contentItem.Files[0].FileId, 0);
            Assert.AreEqual(contentItem.Files[1].FileId, 1);
            Assert.AreEqual(contentItem.Files[2].FileId, 2);
        }