Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final settings = SettingsRepository();
  await settings.loaded;
  runApp(MyApp(settingsRepository: settings));
}
class MyApp extends StatelessWidget {
  const MyApp({Key? key, required this.settingsRepository}) : super(key: key);
  final SettingsRepository settingsRepository;
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: HomePage(settingsRepository: settingsRepository),
...
      );
  }
}
class HomePage extends StatefulWidget {
  const HomePage({Key? key, required this.settingsRepository}) : super(key: key);
  final SettingsRepository settingsRepository;
...

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final settings = SettingsRepository();
  await settings.loaded;
  GetIt.instance.registerSingleton(settings);
  runApp(const MyApp());
}
class HomePage extends StatefulWidget {
  const HomePage({Key? key}) : super(key: key);
  @override
  _HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
  SettingsRepository get settingsRepository => GetIt.instance.get<SettingsRepository>();
...

Future<void> _loadWeather() async {
    final position = await Geolocator.getLastKnownPosition();
    final Map<DateTime, WeatherCondition> predictions;
    if (widget.settingsRepository.remoteServerName == YandexWeatherProvider.providerName) {
      predictions = await YandexWeatherProvider().loadPredictions(position?.latitude ?? 0.0, position?.longitude ?? 0.0);
    } else {
      predictions = await VisualCrossingWeatherProvider().loadPredictions(position?.latitude ?? 0.0, position?.longitude ?? 0.0);
    }
    currentWeather = predictions[DateTime.now().hourStart];
    setState(() {});
  }

// в main.dart
Future<void> main() async {
  ...
  GetIt.instance.registerSingleton<WeatherProvider>(settings.remoteServerName == YandexWeatherProvider.providerName ? YandexWeatherProvider() : VisualCrossingWeatherProvider());
  ...
}
...
// при загрузке погоды
WeatherProvider get weatherProvider => GetIt.instance.get<WeatherProvider>();
Future<void> _loadWeather() async {
    final position = await Geolocator.getLastKnownPosition();
    final predictions = await weatherProvider.loadPredictions(position?.latitude ?? 0.0, position?.longitude ?? 0.0);
    currentWeather = predictions[DateTime.now().hourStart];
    setState(() {});
  }
...
// при переключении настроек пользователя
void _changeServer(String? value) {
    if (value == null) return;
    settingsRepository.remoteServerName = value;
    GetIt.instance.unregister<WeatherProvider>();
    GetIt.instance.registerSingleton<WeatherProvider>(value == YandexWeatherProvider.providerName ? YandexWeatherProvider() : VisualCrossingWeatherProvider());
    setState(() {});
  }

class MockProvider extends Mock implements WeatherProvider {}
void main() {
  final repository = MockProvider();
  setUpAll(() {
    final service = GetIt.instance;
    service.registerSingleton<WeatherProvider>(repository);
  });
  testWidgets('отображение данных о погоде', (WidgetTester tester) async {
    when(repository.loadPredictions(any, any)).thenAnswer((_) async {
      return {DateTime.now().hourStart: WeatherCondition(windDirection: WindDirection.north, temperature: 10.0, windSpeed: 3.0, windGust: 8.0)};
    });
    await tester.pumpWidget(const MaterialApp(
      home: HomePage(),
    ));
    await tester.pumpAndSettle();
    final titleText = find.text('Current weather:');
    expect(titleText, findsOneWidget);
    final weather = find.text('Ветер: 3.0 N, порывами 8.0, температура: 10.0');
    expect(weather, findsOneWidget);
  });
}