public void StockLogicTest()
{
LibraryLogic logic = new LibraryLogic(new Library());
var b = new Book("Dune", "Herbert", BType.SciFi, 25, 1);
logic.AddToStock(b);
Assert.IsTrue(logic.GetLibrary.Stock.Contains(b));
Assert.AreEqual(logic.GetLibrary.Stock.Count(), 1);
Assert.IsTrue(logic.IsInStock(b));
logic.AddToStock(b);
Assert.AreEqual(logic.GetLibrary.Stock.Count(), 1);
logic.RemoveFromStock(logic.GetLibrary.Stock[0]);
Assert.AreEqual(logic.GetLibrary.Stock.Count(), 0);
}