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// then parse the JSON.
return Album.fromJson(jsonDecode(response.body) as Map<String, dynamic>);
} 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;
const Album({required this.userId, required this.id, required this.title});
factory Album.fromJson(Map<String, dynamic> json) {
return Album(
userId: json['userId'] as int,
id: json['id'] as int,
title: json['title'] as String,
);
}
}
void main() => runApp(const MyApp());
class MyApp extends StatefulWidget {
const MyApp({super.key});
@override
State<MyApp> 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(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
),
home: Scaffold(
appBar: AppBar(
title: const 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 const CircularProgressIndicator();
},
),
),
),
);
}
}<code_end>
<topic_end>
<topic_start>test/fetch_album_test.dart
<code_start>import 'package:flutter_test/flutter_test.dart';
import 'package:http/http.dart' as http;
import 'package:mocking/main.dart';
import 'package:mockito/annotations.dart';
import 'package:mockito/mockito.dart';
import 'fetch_album_test.mocks.dart';
// Generate a MockClient using the Mockito package.
// Create new instances of this class in each test.
@GenerateMocks([http.Client])
void main() {
group('fetchAlbum', () {
test('returns an Album if the http call completes successfully', () async {
final client = MockClient();
// Use Mockito to return a successful response when it calls the
// provided http.Client.
when(client
.get(Uri.parse('https://jsonplaceholder.typicode.com/albums/1')))
.thenAnswer((_) async =>
http.Response('{"userId": 1, "id": 2, "title": "mock"}', 200));
expect(await fetchAlbum(client), isA<Album>());
});
test('throws an exception if the http call completes with an error', () {
final client = MockClient();
// Use Mockito to return an unsuccessful response when it calls the
// provided http.Client.
when(client
.get(Uri.parse('https://jsonplaceholder.typicode.com/albums/1')))
.thenAnswer((_) async => http.Response('Not Found', 404));
expect(fetchAlbum(client), throwsException);
});
});
}<code_end>
<topic_end>
<topic_start>
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