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();
}