private int Add(string url)
 {
     var longUrl = new LongUrl { Url = url };
     longUrl = longUrlRepository.Add(longUrl);
     longUrlRepository.Save();
     return longUrl.Id;
 }
 public void Initialize()
 {
     longUrl = new LongUrl {Id = 1, Url = "https://github.com/marciotoshio/MyPersonalShortner"};
     validationContext = new ValidationContext(longUrl, null, null);
 }