public async Task AddTest()
 {
     var fakeRepository = Mock.Of <ICommentRepository>();
     var CommentService = new CommentService(fakeRepository);
     var Comment        = new Comment()
     {
         Id = 1, CreatedAt = DateTime.Parse("2018-03-03"), CommentDescription = "CommentDescription"
     };
     await CommentService.AddAndSafe(Comment);
 }