我有一个文件一个函数 fetchPosts()
它负责从服务器获取新帖子并将它们存储在本地 sqlite 数据库中。
正如 sqflite 上的推荐 doc ,我将单个引用存储到我的数据库。
这是我的database.dart
的内容文件:
import 'dart:async';
import 'package:path/path.dart';
import 'package:sqflite/sqflite.dart';
class DBProvider {
DBProvider._();
static final DBProvider db = DBProvider._();
static Database _database;
static Future<Database> get database async {
if (_database != null) return _database;
// if _database is null, we instantiate it
_database = await _initDB();
return _database;
}
static Future<Database> _initDB() async {
final dbPath = await getDatabasesPath();
String path = join(dbPath, 'demo.db');
return await openDatabase(path, version: 1, onCreate: _onCreate);
}
static Future<String> insert(String table, Map<String, dynamic> values) async { /* insert the record*/ }
// Other functions like update, delete etc.
}
然后我在我的
fetchPosts.dart
中使用它文件import 'dart:convert';
import 'package:http/http.dart' as http;
import '../services/database.dart';
const url = 'https://myapp.herokuapp.com';
Future<void> fetchPosts() {
final client = http.Client();
return fetchPostsUsingClient(client);
}
Future<void> fetchPostsUsingClient(http.Client client) async {
final res = await client.get(url);
final posts await Post.fromJson(json.decode(response.body));
for (var i = 0; i < posts.length; i++) {
await DBProvider.insert('posts', posts[i]);
}
}
在我的测试中,我如何才能
verify
那个DBProvider.insert()
已被调用?fetchPosts_test.dart
import 'package:test/test.dart';
import 'package:http/http.dart' as http;
import 'package:mockito/mockito.dart';
import 'package:../services/fetchPosts.dart';
// Create a MockClient using the Mock class provided by the Mockito package.
// Create new instances of this class in each test.
class MockClient extends Mock implements http.Client {}
void main() {
group('fetchPosts', () {
test('update local db', () async {
final client = MockClient();
// Use Mockito to return a successful response when it calls the provided http.Client.
when(client.get()).thenAnswer((_) async => http.Response('{"title": "Test"}', 200));
await fetchPostsWithClient(client);
verify(/* DBProvider.insert has been called ?*/);
});
});
}
最佳答案
最终,我不得不重写我的 database.dart
使其可测试/可模拟。
这是新文件:
import 'dart:async';
import 'package:path/path.dart';
import 'package:sqflite/sqflite.dart';
class DBProvider {
static final DBProvider _singleton = DBProvider._internal();
factory DBProvider() {
return _singleton;
}
DBProvider._internal();
static Database _db;
static Future<Database> _getDatabase() async {
if (_db != null) return _db;
// if _database is null, we instantiate it
_db = await _initDB();
return _db;
}
static Future<Database> _initDB() async {
final dbPath = await getDatabasesPath();
String path = join(dbPath, 'demo.db');
return openDatabase(path, version: 1, onCreate: _onCreate);
}
Future<String> insert(String table, Map<String, dynamic> values) async {
final db = await _getDatabase();
return db.insert(table, values);
}
// ...
}
现在我可以使用与 http.Client 相同的技巧。
谢谢@RémiRousselet
关于unit-testing - 如何使用 Mockito 在 Flutter 中模拟静态方法?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58238435/