yshean

class MyApp extends StatelessWidget {
  static final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
  
  Widget build(BuildContext context) {
    final pushNotificationService = PushNotificationService(_firebaseMessaging);
    pushNotificationService.initialise();
    // the rest of your build method
  }
}

yshean

import 'package:firebase_messaging/firebase_messaging.dart';

class PushNotificationService {
  final FirebaseMessaging _fcm;

  PushNotificationService(this._fcm);

  Future initialise() async {
    if (Platform.isIOS) {
      _fcm.requestNotificationPermissions(IosNotificationSettings());

yshean

import 'package:flutter_test/flutter_test.dart';
import 'package:mocktail_image_network/mocktail_image_network.dart';
 
testWidgets(
  'renders an image with the provided image url',
  (tester) async {
    const expectedImageUrl = 'media.giphy.com/example.jpg';
    await mockNetworkImages(() async {
      await tester.pumpWidget(app); // your app is a widget that contains your network image
      /** You should also wrap your NetworkImage or Image.network with a DecoratedBox or other widget as the parent,