public void UpdateBookState()
{
Books book = new Books()
{
id = 109, author = "Jane Austin", title = "Awesome book", type = "Classic", penaltyCost = 20, state = 1
};
Assert.IsTrue(BookCRUD.addBook(book.id, book.title, book.author, book.type, book.penaltyCost, DateTime.Today, (int)book.state));
Assert.IsTrue(BookCRUD.updateState(book.id, 0));
book = BookCRUD.getBook(book.id);
Assert.AreEqual(book.state, 0);
}