public void AddFavorityGenreToFantasyBooks_AddFavorityGenreToBooksOfFantasyGenre()
        {
            var favorityGenre = "favority";

            _repository.AddFavorityGenreToFantasyBooks();

            var actualResult = GetBooksOfFantasyGenre();

            actualResult.ForEach(book => Assert.Contains(favorityGenre, book.Genre));

            _repository.AddFavorityGenreToFantasyBooks();

            actualResult.ForEach(book => Assert.Equal(1, book.Genre.Count(item => item == favorityGenre)));
        }