firebase - 如何使用 Firebase 测试 Flutter 应用程序？

Question

我使用 Flutter 和 Firebase 作为我的数据库。我想对我的应用程序进行一些单元测试，但是当我开始这个测试时:

testWidgets('MyWidget has a title and message', (WidgetTester tester) async {
    // Create the widget by telling the tester to build it.
    await tester.pumpWidget(LoginPage());

    expect(true, true);
});

我有异常(exception):

No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()

但是 Firebase.initializeApp() 在我的 main.dart 中被调用:

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}

而且我不知道如何在我的测试中初始化 Firebase 应用程序。

Answer 1

将此作为社区维基发布，因为它基于@GuilhermeGabanelli 的评论。
如果您检查 this flutterfire documentation关于如何使用 Firebase 服务执行单元测试，您将看到:

The Firebase libraries need to run on an actual device or emulator. So if you want to run unit tests, you'll have to use Fakes instead. A Fake is a library that implements the API of a given Firebase library and simulates its behavior.

...

When initializing your app, instead of passing the actual instance of a Firebase library (e.g. FirebaseFirestore.instance if using Firestore), you pass an instance of a fake (e.g. FakeFirebaseFirestore()). Then the rest of your application will run as if it were talking to Firebase.

接下来是带有示例代码的示例。我相信这是您面临的问题的原因，如果您更改代码以使用 Fakes，则应该解决此问题。