public void AddRentBook()
{
model.BorrowBook(IdRent, IdReaderRent);
this.OnPropertyChanged(nameof(Books));
this.OdswiezBooks();
this.OdswiezRentedBooks();
}
public void Test_DropOffBook()
{
LibraryModel model = new LibraryModel();
Book testbook = model.AddBook(1, "Pan Tadeusz", "Adam Mickiewicz");
Reader testreader = model.AddReader(1, "Marcin", "Wołkowicz");
model.BorrowBook(1, 1);
model.DropOffBook(1);
Assert.AreEqual(0, testreader.Books.Count);
}