MissingPluginException error on Firebase.initializeApp() calling when using FirebaseMessaging plugin in flutter tests

[OrlovPetr]

Hello!
Can you help me with this problem.
Trying to start this test:

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  test('Test user instance', () async {
    /// Prepare user model for tests.
    await App().init();

    // expect(user.isAuth, true);
    // expect(user.miob, true);
    // expect(user.rememberMe, false);
  });
}

Method App().init() crashes on method await InternalFirebase.whenAppStarted() from class InternalFirebase which looks like this:

class InternalFirebase {
  static FirebaseMessaging _firebaseMessaging;

  static Future<void> whenAppStarted() async {
    await Firebase.initializeApp();

    _firebaseMessaging = FirebaseMessaging.instance;
    await _firebaseMessaging.requestPermission();
    await _firebaseMessaging.subscribeToTopic('APPS');
    await FirebaseNetwork(url: '${API_SERVICE_MAIN_URL}push/devices').registerDevice(_firebaseMessaging);
  }
}

I've been running tests in debug mode and crash is on this line: await Firebase.initializeApp();:

package:flutter/src/services/platform_channel.dart 156:7  MethodChannel._invokeMethod
MissingPluginException(No implementation found for method Firebase#initializeCore on channel plugins.flutter.io/firebase_core)

In pubspec.yaml I have this packages:

  firebase_messaging: ^10.0.3
  firebase_core: ^1.3.0
  firebase_analytics: ^8.1.2

Flutter doctor report:

[√] Flutter (Channel stable, 2.0.6, on Microsoft Windows [Version 10.0.19043.1110], locale ru-RU)
    • Flutter version 2.0.6 at C:\Flutter
    • Framework revision 1d9032c7e1 (3 months ago), 2021-04-29 17:37:58 -0700
    • Engine revision 05e680e202
    • Dart version 2.12.3

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at C:/Users/porlo/AppData/Local/Android/Sdk
    • Platform android-30, build-tools 30.0.3
    • ANDROID_HOME = C:/Users/porlo/AppData/Local/Android/Sdk
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 4.1.0)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)

[√] Connected device (2 available)
    • Chrome (web) • chrome • web-javascript • Google Chrome 91.0.4472.124
    • Edge (web)   • edge   • web-javascript • Microsoft Edge 91.0.864.48

• No issues found!

This problem caused only on tests - in debug, profile and release modes all is ok.

I'm tried flutter clean and rebuild project, trying use hardcoded settings for Firebase.initializeApp() and looked to this issue: #3311 but don't understand where is pb...

[felipecastrosales]

you can resolved this error?

[OrlovPetr]

As I know, for tests Firebase require mock configuration and don't work with real Firebase entity and API. Try to read about Flutter + Firebase test with mock. Maybe it ll help you...

[felipecastrosales]

As I know, for tests Firebase require mock configuration and don't work with real Firebase entity and API. Try to read about Flutter + Firebase test with mock. Maybe it ll help you...

Wow, thank you so much for the guidance my friend, really.
In a few hours I will try and update you.

[OrlovPetr]

You are welcome)

[felipecastrosales]

@OrlovPetr I managed to take the test. 🥳
In fact, what helped me the most was this.
* https://stackoverflow.com/a/64730015/13096514

There was also another mock that I hadn't configured properly and that was giving me inaccurate logs.
Thanks for your help and availability. 👍

[OrlovPetr]

Great! I'm glad you were able to solve your problem)