public async Task TestAddUserToFollower()
        {
            var options = new DbContextOptionsBuilder <ApplicationDbContext>()
                          .UseInMemoryDatabase(Guid.NewGuid().ToString());

            var repository = new EfDeletableEntityRepository <Follower>(new ApplicationDbContext(options.Options));
            var service    = new UserServices(repository);

            var model = new UserFollowerViewModel
            {
                GameId = 5,
                UserId = "4",
            };

            for (int i = 0; i < 2; i++)
            {
                await service.AddUserToFollower(model);
            }

            var counter = await repository.All().CountAsync();

            Assert.Equal(1, counter);
        }