public void GetArticalFromEmptyInventoryTest()
        {
            var supplier = new Supplier1();

            var articleFromInventory = supplier.GetArticle(23);

            Assert.Null(articleFromInventory);
        }
        public void GetArticleWithNoExestingIdTest()
        {
            var article = new Article
            {
                ID = 2
            };
            var supplier = new Supplier1();

            supplier.AddArticle(article);

            var articleFromInventory = supplier.GetArticle(23);

            Assert.Null(articleFromInventory);
        }
        public void GetArticleTest()
        {
            var article = new Article
            {
                ID = 2
            };
            var supplier = new Supplier1();

            supplier.AddArticle(article);

            var articleFromInventory = supplier.GetArticle(article.ID);

            Assert.Equal(articleFromInventory, article);
        }