相关疑难解决方法(0)

我正在构建一个 Flutter 应用程序并且我已经集成了 Firebase，但是当我点击一个按钮来注册、登录或注销时，我不断收到这个错误。我见过其他人问过同样的问题，但似乎没有一个对我有用。我正在使用 Flutter 和Android Studio。我该如何解决这个问题？

这是我的代码的摘录

class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.red,
      body: Center(
        child: Container(
          child: RaisedButton(
            onPressed: () {
              FirebaseAuth.instance.signOut().then((value) {
                Navigator.pushReplacement(
                    context,
                    MaterialPageRoute(
                        builder: (context) =>
                            LoginScreen()));
              });
            },
            child: Text("Logout"),
          )
        )
      )
    );
  }
}

下面是抛出的异常

class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> { …

所以我是颤振的新手，并尝试在我的应用程序上执行小部件测试，但我不断收到这个奇怪的错误。下面是我的测试文件

import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:folk_team_app/provider/auth_provider.dart';
import 'package:folk_team_app/screens/phone_login.dart';
import 'package:provider/provider.dart';

void main() async {
  TestWidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();

  Widget loginScreen = ChangeNotifierProvider<AuthProvider>(
      create: (context) => AuthProvider(),
      builder: (context, child) {
        return MaterialApp(
          home: PhoneLogineScreen(),
        );
      });

  testWidgets('Phone Authetication Page', (WidgetTester tester) async {
    // Build our app and trigger a frame.

    await tester.pumpWidget(loginScreen);
    await tester.pump(const Duration(seconds: 10));
    

    final titleText = find.text('Screen Title');

    // Verify that our counter starts at 0.
    expect(titleTextt, findsOneWidget);
  });
}

这是错误：

我正在尝试测试我的firebase auth方法。身份验证方法包括登录、注销、注册等。这是我想要执行单元测试的方法。

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

我尝试Firebase.initializeApp在测试main方法中初始化它也不起作用。

 class MockUserRepository extends Mock implements AuthService {
  final MockFirebaseAuth auth;
  MockUserRepository({this.auth});
 }
 class MockFirebaseAuth extends Mock implements FirebaseAuth{}
 class MockFirebaseUser extends Mock implements FirebaseUser{}
 class MockFirebase extends Mock implements Firebase{}
 void main() {
   MockFirebase firebase=MockFirebase();
   MockFirebaseAuth _auth = MockFirebaseAuth();
   BehaviorSubject<MockFirebaseUser> _user = BehaviorSubject<MockFirebaseUser>();
   when(_auth.onAuthStateChanged).thenAnswer((_){
      return _user;
     });
   AuthService _repo = AuthService.instance(auth: _auth);
   group('user repository test', (){
       when(_auth.signInWithEmailAndPassword(email: "email",password: "password")).thenAnswer((_)async{
  _user.add(MockFirebaseUser()); …