[Usage question] Using GetIt.I.get() in integration test

[CaptainDario]

I am trying to use GetIt in my integration test but I am having some difficulties.
When trying to access registered singletons in GetIt, I am always facing this error:

_AssertionError ('package:get_it/get_it_impl.dart': Failed assertion: line 370 pos 7: 'instanceFactory != null': Object/factory with  type DrawScreenState is not registered inside GetIt. 
(Did you accidentally do GetIt sl=GetIt.instance(); instead of GetIt sl=GetIt.instance;
Did you forget to register it?))

I have a function to register my singletons:

// Initialize GetIt by initializing and registering all the instances for it
Future<void> initGetIt() async {
  
  ...

  // draw screen services 
  GetIt.I.registerSingleton<DrawScreenState>(DrawScreenState(
    Strokes(), KanjiBuffer(), DrawingLookup(), DrawScreenLayout.Portrait)
  );
  
  ...
}

This function is called when creating my app instance. However, when I call my function, the singletons are not registered in GetIt and the above Exception is thrown. My code looks like this:

void main() {
  IntegrationTestWidgetsFlutterBinding.ensureInitialized();

  testWidgets("DrawScreen test", (WidgetTester tester) async {

    IS_TESTING_DRAWSCREEN = true;

    // create app instance and wait until it finished initializing
    app.main();    // <-- this calls initGetIt()
    print(GetIt.I<DrawScreenState>());      // <-- this raises the exception
    await tester.pumpAndSettle(Duration(seconds: 2));

    // check that the app does not show any predictions on start up
    List<String> preds = (tester.widgetList(find.byType(PredictionButton))).map((e) => (e as PredictionButton).char).toList();

    ...
  }
}

In the README integration tests are mentioned, therefore I assume that it should be possible to access GetIt in them. This leads me to the question what am I doing wrong?

[CaptainDario]

@escamoteur any ideas on this?

[escamoteur]

Your app init function is not awaited if I understand it correctly. Am 24. März 2022, 16:32 +0100 schrieb CaptainDario ***@***.***>:

…

@escamoteur any ideas on this? — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.Message ID: ***@***.***>

[CaptainDario]

Your app init function is not awaited if I understand it correctly. Am 24. März 2022, 16:32 +0100 schrieb CaptainDario @.>:
…
@escamoteur any ideas on this? — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.Message ID: @.>

Oh wow, Now I feel so stupid for asking this.
This literally kept me busy for days.

Thank you so much!

[escamoteur]

No worries, I was there before myself Am 24. März 2022, 17:27 +0100 schrieb CaptainDario ***@***.***>:

…

> Your app init function is not awaited if I understand it correctly. Am 24. März 2022, 16:32 +0100 schrieb CaptainDario @.>: > … > @escamoteur any ideas on this? — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.Message ID: @.> Oh wow, Now I feel so stupid for asking this. This literally kept me busy for days. Thank you so much! — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.Message ID: ***@***.***>