EasyLocalization translations not found in test widgets

[chitgoks]

void main() {
  setUpAll(() async {
    SharedPreferences.setMockInitialValues({});
    await EasyLocalization.ensureInitialized();
  });

  testWidgets('sample unit test', (WidgetTester tester) async {
    await tester.pumpWidget(
      EasyLocalization(
        startLocale: Languages.deAUT,
        supportedLocales: Languages.all,
        path: 'assets/langs',
        child: MultiRepositoryProvider(
          providers: [
            ...
          ],
          child: MultiBlocProvider(
            providers: [
              ...
            ],
            child: Builder(
              builder: (context) {
                return MaterialApp(
                  localizationsDelegates: context.localizationDelegates,
                  supportedLocales: context.supportedLocales,
                  locale: context.locale,
                  home: Scaffold(
                    body: MediaQuery(
                      data: MediaQueryData.fromView(View.of(context)),
                      child: const Text('sample_translation'.tr()),
                    ),
                  ),
                );
              },
            ),
          ),
        ),
      ),
    );

    await tester.pumpAndSettle();
    print('sample_translation'.tr());
  });
}

my problem here is that app works fine but in my test widget, it says [🌎 Easy Localization] [WARNING] Localization key [sample_translation] not found

any clue why? structure is that under assets folder > langs folder > files are de-AUT.json and en-EN.json