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_Requested_For_BooksList_Should_Contain_Books()
 {
     Biblotica biblotica = new Biblotica (new List<Book>(){new Book("a","a",1990,"ISBN190")});
     List<Book> books =  biblotica.GetBookList ();
     Assert.AreEqual (1, books.Count );
 }