public CartMigrator(ICartIdRetriever cartIdRetriever,
     CheckoutEntities checkoutEntities)
 {
     this.cartIdRetriever = cartIdRetriever;
     this.checkoutEntities = checkoutEntities;
 }
 public CartRetriever(CheckoutEntities checkoutEntities,
     ICartIdRetriever cartIdRetriever)
 {
     this.checkoutEntities = checkoutEntities;
     this.cartIdRetriever = cartIdRetriever;
 }