public void Initialize()
        {
            classificationService = new StubClassificationService();
            classificationService.AddBook(Classification1, "T1", "A1", "2001");
            classificationService.AddBook(Classification2, "T2", "A2", "2002");

            scanner = new ScanStation(Branch1Id, classificationService);

            holdingService = new HoldingService();
            holdingService.DeleteAllHoldings();

            patronService = new PatronService();
            PatronService.DeleteAllPatrons();

            patronId1 = patronService.Add("Joe");
            patronId2 = patronService.Add("Jane");

            var holding = scanner.AddNewMaterial(Isbn1);

            Assert.That(holding.Barcode, Is.EqualTo(barcode1));
        }
        public void AddSecondNewBookWithSameIsbn()
        {
            var holding = scanner.AddNewMaterial(Isbn1);

            Assert.That(holding.Barcode, Is.EqualTo(Classification1 + ":2"));
        }