public void AddTagsToPicture()
        {
            MockDAL mock = new MockDAL();

            mock.InsertAllPictures();
            mock.InsertAllEXIFData();
            mock.InsertAllIPTCData();

            mock.AddTagToPicture(5, "Batsignal");

            Assert.That(mock.Tags.Count, Is.EqualTo(1));
            Assert.That(mock.PictureList[4].Tags[0], Is.EqualTo("Batsignal"));
        }