private void Button_add_Click(object sender, RoutedEventArgs e)
        {
            (bool, int)ratingInput = validator.CheckIntInput(textBox_rating_value.Text);

            if (!ratingInput.Item1)
            {
                MessageBox.Show("Rating must be an integer");
            }
            else if (ratingInput.Item2 <= 0 || ratingInput.Item2 > 5)
            {
                MessageBox.Show("Rating must be between 1 and 5");
            }
            else
            {
                CrudReview.Create(ratingInput.Item2, textBox_comment_value.Text, Reviewer, Product);
                Close();
            }
        }
 public void IntInputCheck(string input, bool expectedBool, int expectedInt)
 {
     (bool, int)result = validator.CheckIntInput(input);
     Assert.AreEqual(expectedBool, result.Item1);
     Assert.AreEqual(expectedInt, result.Item2);
 }