public void Biblotica_When_Book_Is_Checkedout_Should_Not_Be_In_Available_Books()
{
Biblotica biblotica = new Biblotica (new List<Book>(){new Book("a","a",1990,"ISBN190")});
biblotica.Checkout ("ISBN190");
List<Book> books = biblotica.GetBookList ();
Assert.AreEqual (0, books.Count );
}
public void Biblotica_When_A_NonAvailable_Book_Is_Checkedout_Should_Return_Null()
{
Biblotica biblotica = new Biblotica (new List<Book>(){new Book("a","a",1990,"ISBN190")});
Book actual = biblotica.Checkout ("ISBN1900");
Assert.IsNull (actual);
}