public HeroApplicationTests()
 {
     _hero = new Hero {Id= new ObjectId(_id)};
     _heroRepo.Setup(x => x.Get(_id)).Returns(_hero);
     _heroRepo.Setup(x => x.Get()).Returns(new List<Hero>{_hero});
     _application = new HeroApplication(_heroRepo.Object);
 }
 public void Update(Hero hero)
 {
     HeroCollection.ReplaceOne(GetIdFilter(hero.Id),hero);
 }
 public void Add(Hero hero)
 {
     HeroCollection.InsertOne(hero);
 }