public async Task Should_InvokeWishListRepositoryDeleteAsync_Once()
{
var wish = new Wishlist();
wish.AddItem(1);
wish.AddItem(2);
_mockWishlistRepo.Setup(x => x.GetByIdAsync(It.IsAny <int>()))
.ReturnsAsync(wish);
var wishListService = new WishlistService(_mockWishlistRepo.Object, null);
await wishListService.DeleteWishlistAsync(It.IsAny <int>());
_mockWishlistRepo.Verify(x => x.DeleteAsync(It.IsAny <Wishlist>()), Times.Once);
}