@Test
public void shouldReportErrorMessageWhenUserSelectsABookThatDoesNotExist() throws IOException {
when(bufferedReader.readLine()).thenReturn("2", "100", "1", "0");
when(library.checkOutBook(99)).thenReturn(false);
when(library.checkOutBook(0)).thenReturn(true);
bookList.add(harryPotter);
menu.respondToUserInput(library);
verify(printStream).println(contains("That book is not available."));
}
private void successfullyReturnBook() throws IOException {
when(bufferedReader.readLine()).thenReturn("2", "1", "0");
when(library.checkOutBook(0)).thenReturn(true);
}