@Test
	public void databaseIsUsedIfDataIsPresent() {
		ExternalISBNDataService databaseService = mock(ExternalISBNDataService.class);
		ExternalISBNDataService webService = mock(ExternalISBNDataService.class);

		when(databaseService.lookup("0140177396")).thenReturn(new Book("0140177396","abc","abc"));

		StockManager stockManager = new StockManager();
		stockManager.setWebService(webService);
		stockManager.setDatabaseService(databaseService);

		String isbn = "0140177396";
		String locatorCode = stockManager.getLocatorCode(isbn);

		verify(databaseService).lookup("0140177396");
		verify(webService, never()).lookup(anyString());

	}