public void Can_Get_All_Heroes()
        {
            Mock <IRepository <Hero> > mock = new Mock <IRepository <Hero> >();

            mock.Setup(m => m.GetAll()).Returns(new List <Hero> {
                new Hero {
                    HeroId = 1, Name = "Hero1"
                },
                new Hero {
                    HeroId = 2, Name = "Hero2"
                },
                new Hero {
                    HeroId = 3, Name = "Hero3"
                },
            });

            //BookRepository repository = new BookRepository();
            TestHelps repository = new TestHelps();

            var heroes = repository.GetAllHeroes(mock.Object).ToList();

            Assert.AreEqual(3, heroes.Count);
        }