public void have_non_empty_title() { //_feed.SetTitle("Event stream 'test'"); _feed.SetId(FeedUrl); _feed.SetUpdated(DateTime.UtcNow); _feed.SetAuthor(AtomSpecs.Author); _feed.AddLink(FeedUrl, "self", null); Assert.Throws <ArgumentNullException>(() => _feed.SetTitle(null)); Assert.Throws <AtomSpecificationViolationException>(() => _feed.WriteXml(_writer)); }