public void should_not_save_user_if_found(User user, string login, string password, [Frozen]IRepository repository,
            [Frozen] IUserProvider userProvider, AccountManager accountManager)
        {
            userProvider.GetUserByName(login).Returns(user);

            accountManager.RegisterUser(login, password);

            repository.DidNotReceiveWithAnyArgs().SaveUser(null);
        }
        public void should_not_save_user_if_found()
        {
            var user = new User {Name = "some name"};
            userProvider.GetUserByName(login).Returns(user);

            accountManager.RegisterUser(login, password);

            repository.DidNotReceiveWithAnyArgs().SaveUser(null);
        }