pruebas unitarias con mockito en el ejemplo de código flutter

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Ejemplo: prueba unitaria con mockito en Flutter

import 'dart:async';
import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;

Future<Album> fetchAlbum(http.Client client) async 
  final response =
      await client.get(Uri.https('jsonplaceholder.typicode.com', 'albums/1'));

  if (response.statusCode == 200) 
    // If the server did return a 200 OK response,
    // then parse the JSON.
    return Album.fromJson(jsonDecode(response.body));
   else 
    // If the server did not return a 200 OK response,
    // then throw an exception.
    throw Exception('Failed to load album');
  


class Album 
  final int userId;
  final int id;
  final String title;

  Album(required this.userId, required this.id, required this.title);

  factory Album.fromJson(Map<String,dynamic> json) 
    return Album(
      userId: json['userId'],
      id: json['id'],
      title: json['title'],
    );
  


void main() => runApp(MyApp());

class MyApp extends StatefulWidget 
  MyApp(Key? key) : super(key: key);

  @override
  _MyAppState createState() => _MyAppState();


class _MyAppState extends State<MyApp> 
  late final Future<Album> futureAlbum;

  @override
  void initState() 
    super.initState();
    futureAlbum = fetchAlbum(http.Client());
  

  @override
  Widget build(BuildContext context) 
    return MaterialApp(
      title: 'Fetch Data Example',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text('Fetch Data Example'),
        ),
        body: Center(
          child: FutureBuilder<Album>(
            future: futureAlbum,
            builder: (context, snapshot) 
              if (snapshot.hasData) 
                return Text(snapshot.data!.title);
               else if (snapshot.hasError) 
                return Text('$snapshot.error');
              

              // By default, show a loading spinner.
              return CircularProgressIndicator();
            ,
          ),
        ),
      ),
    );
  

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