public void Should_list_all_books()
{
Catalogue catalogue = new Catalogue();
catalogue.Add(new Book("1857239407", "George Lucas", "Star Wars: A New Hope", 256, 20));
catalogue.Add(new Ebook("0450011844", "Frank Herbert", "Dune", 608));
Assert.That(catalogue.GetTitles(), Is.EqualTo(new[]
{
"Dune",
"Star Wars: A New Hope"
}));
}
