public void RestaurantGrade_Has_Valid_Properties()
        {
            var rg = new RestaurantGrade(DateTime.Now, "A", 1);

            rg.Date.ShouldNotBeNull();
            rg.LetterGrade.ShouldNotBeEmpty();
            rg.NumericScore.ShouldNotBe(0);
        }
        public void RestaurantGrade_Can_Be_Instantiated()
        {
            var rg = new RestaurantGrade();

            rg.ShouldNotBeNull();
        }