public void TestGetWarmArticles() { //Arrange var service = new ArticleServices(); ArticleType shirt = (ArticleType)Enum.Parse(typeof(ArticleType), "Shirt"); ArticleType pants = (ArticleType)Enum.Parse(typeof(ArticleType), "Pants"); //Act service.CreateArticle("red shirt", shirt, "warm"); service.CreateArticle("blue shirt", shirt, "cold"); service.CreateArticle("green pants", pants, "warm"); articlesDictionary = service.GetArticles(); List <string> articles = new List <string>(); articles.Add("red shirt"); articles.Add("blue shirt"); articles.Add("green pants"); //Assert Assert.AreEqual(service.getWarmArticles(articles).ElementAt(0), articles.ElementAt(0)); Assert.AreEqual(service.getWarmArticles(articles).ElementAt(1), articles.ElementAt(2)); }