import 'dart:async';

import 'package:background_downloader/background_downloader.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter_test/flutter_test.dart';

class _FailingStorage implements PersistentStorage {
  final failure = StateError('download storage unavailable');
  @override
  Future<void> initialize() async => throw failure;
  @override
  dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
}

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  test(
    'Android initialization failure reaches ready instead of unhandled future',
    () async {
      final previous = debugDefaultTargetPlatformOverride;
      debugDefaultTargetPlatformOverride = TargetPlatform.android;
      addTearDown(() => debugDefaultTargetPlatformOverride = previous);
      final storage = _FailingStorage();
      final unhandled = <Object>[];
      final done = Completer<void>();
      Object? observed;
      runZonedGuarded(() async {
        final downloader = FileDownloader(persistentStorage: storage);
        try {
          await downloader.ready.timeout(const Duration(milliseconds: 200));
        } catch (error) {
          observed = error;
        } finally {
          done.complete();
        }
      }, (error, stack) => unhandled.add(error));
      await done.future;
      expect(observed, same(storage.failure));
      expect(unhandled, isEmpty);
    },
  );
}