public void DeleteRestaurantAsync_Test()
        {
            var restaurantDataManager = new Mock <IRestaurantDataManager>();

            restaurantDataManager.Setup(x => x.DeleteRestaurantAsync(123)).Returns(Task.CompletedTask);

            var restaurantRepo = new RestaurantRepository(restaurantDataManager.Object);

            restaurantRepo.DeleteRestaurantAsync(123).Wait();
            restaurantDataManager.VerifyAll();
        }