public bool IsConnectionEstablished(UsersRepository mongoDbRepo)
        {
            var connected = mongoDbRepo.CheckConnection();

            return(connected);
        }
        UsersRepository _mongoDbRepo = new UsersRepository("mongodb://localhost:27017"); // GOOD
        //UsersRepository _mongoDbRepoFailed = new UsersRepository("mongodb://localhost:27016"); // FAIL

        public DemoUser(UsersRepository mongoDbRepo)
        {
            _mongoDbRepo = mongoDbRepo;
        }