mock_cart_class_sample.dart

import 'dart:convert';
import 'dart:io';

class Item {
  Item({this.id, this.price, this.name});
  Item.fromJson(Map<String, dynamic> json)
      : this.id = json["id"],
        this.price = json["price"],
        this.name = json["name"];

  final int id;
  final int price;
  final String name;
}

class Cart {
  Cart({this.items});
  
  final List<Item> items;
  int get totalPrice => items.fold(0, (cur, item) => cur + item.price);
}

class CartApiClient {
  Future<Map<String, dynamic>> fetchMyCart() async { 
    final parsedUri =
      Uri.parse('https://run.mocky.io/v3/d1634fbf-3860-479e-b049-4dcba1d503d2');
    final myCartRequest = await HttpClient().getUrl(parsedUri);
    final myCartResponse = await myCartRequest.close();
    final myCartJsonString = await utf8.decodeStream(myCartResponse);
    final myCart = jsonDecode(myCartJsonString);
    return myCart;
  }
}

class MockCartApiClient {
  Future<Cart> fetchMyCart() async { 
    return Future.value(Cart(items: [
      Item(id: 1, price: 100, name: 'apple'),
      Item(id: 2, price: 200, name: 'banana')
    ]));
  }
}


void main() async {
  final myCart = await MockCartApiClient().fetchMyCart();
  print(myCart.totalPrice);
}