CatalogOfFreeContent.Common.Catalog.GetListContent C# (CSharp) Méthode

        public IEnumerable<IContent> GetListContent(string title, int numberOfElementsToList)
        {
            IEnumerable<IContent> contentToList = 
                from currentTitle in this.titles[title] 
                select currentTitle;

            return contentToList.Take(numberOfElementsToList);
        }

 public void NoMatchedItemsTest()
 {
     Catalog catalog = new Catalog();
     List<string[]> contentItemParams = new List<string[]>() 
     {
         new string[] { "Firefox v.11.0", "Mozilla", "16148072", "http://www.mozilla.org" },
         new string[] { "One", "Metallica", "8771120", "http://goo.gl/dIkth7gs" },
         new string[] { "Intro C#", "S.Nakov", "12763892", "http://www.introprogramming.info" },
         new string[] { "The Secret", "Drew Heriot, Sean Byrne & others (2006)", "832763834", "http://t.co/dNV4d" }
     };
     IContent application = new ContentItem(ContentType.Application, contentItemParams[0]);
     IContent song = new ContentItem(ContentType.Song, contentItemParams[1]);
     IContent book = new ContentItem(ContentType.Book, contentItemParams[2]);
     IContent movie = new ContentItem(ContentType.Movie, contentItemParams[3]);
     catalog.Add(application);
     catalog.Add(song);
     catalog.Add(book);
     catalog.Add(book);
     catalog.Add(book);
     catalog.Add(movie);
     catalog.Add(movie);
     
     IEnumerable<IContent> matchedItems = catalog.GetListContent("Missing", 1);
     string[] actualTextRepresentations = GetTextRepresentationsOfMatchedItems(matchedItems);
     string[] expectedTextRepresentations = new string[] { };
     
     CollectionAssert.AreEqual(expectedTextRepresentations, actualTextRepresentations);
     Assert.AreEqual(0, matchedItems.Count());
 }