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"));
}