pendingTimer when testing with SentryNavigatorObserver on sentry_flutter 8.2.0

[alestiago]

Platform

Flutter Mobile

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• No issues found!

Version

8.2.0

Steps to Reproduce

1. Create a Flutter Application:

 flutter create my_app --platforms ios,android

2. Add package:sentry_flutter 8.2.0 as a dependency:

flutter pub add sentry_flutter:8.2.0

3. Update lib/main.dart to initialise Sentry:

Future<void> main() async {
  runZonedGuarded(() async {
    await SentryFlutter.init(
      (options) {
        options.dsn = 'https://[email protected]/add-your-dsn-here';
      },
    );

    runApp(const MyApp());
  }, (exception, stackTrace) async {
    await Sentry.captureException(exception, stackTrace: stackTrace);
  });
}

4. Update the _incrementCounter function to navigate somewhere:

 void _incrementCounter() {
    Navigator.push(context, MaterialPageRoute(builder: (context) {
      return const Text('Hello Sentry');
    }));
  }

5. Update the test in widget_test to navigate and assert for the text:

 testWidgets('Counter increments smoke test', (WidgetTester tester) async {
    await tester.pumpWidget(const MyApp());

    await tester.tap(find.byIcon(Icons.add));
    await tester.pumpAndSettle();

    expect(find.text('Hello Sentry'), findsWidgets);
  });

6. Run the test, the test should succeed.

fluter test

7. Add a SentryNavigatorObserver to the MaterialApp in main.dart:

MaterialApp(
  navigatorObservers: [
    SentryNavigatorObserver(),
  ],
  // other parameters

8. Run the test again, the test now fails.

fluter test

The test fails due to:

The following assertion was thrown running a test:
A Timer is still pending even after the widget tree was disposed.
'package:flutter_test/src/binding.dart':
Failed assertion: line 1527 pos 12: '!timersPending'

9. Change the package:sentry_flutter version from 8.2.0 to 8.1.0:

flutter pub add sentry_flutter:8.1.0

10. Run the test again, now the test succeeds.

fluter test

Expected Result

The test succeeds in package:sentry_flutter v8.1.0, it should also succeed in v8.2.0.

Actual Result

A test fails in package:sentry_flutter v8.2.0, but not in v8.1.0.

Are you willing to submit a PR?

None

[buenaflor]

Thanks for the issue and the detailed instructions! We'll have a look

[buenaflor]

For some quick fix you can wrap it in a runAsync

    await tester.runAsync(() async {
      await tester.pumpWidget(const MyApp());

      await tester.tap(find.byIcon(Icons.add));
      await tester.pumpAndSettle();

      expect(find.text('Hello Sentry'), findsWidgets);
    });

the reason for the failure is the change from

    return _appStartCompleter.future;

to

    return _appStartCompleter.future
        .timeout(_timeoutDuration, onTimeout: () => null);

still trying to figure out if therere is a way around that

[alestiago]

@buenaflor any updates regarding a proper fix to this issue besides the quick-fix?

[buenaflor]

Sorry :bow: I haven't come to this issue yet. I'll keep you posted

[alestiago]

Just chiming in again since it has been over a month, are there any updates?

[buenaflor]

hey, we're currently looking at re-designing the parts that are affected by these app start completers since this has also caused some issues in other areas for some users.

[buenaflor]

hey this is going to be addressed as part of improving the app start integration so this should be fixed soon :)