sharedinbox/test/widget/changelog_screen_test.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:sharedinbox/ui/screens/changelog_screen.dart';

class _FakeAssetBundle extends Fake implements AssetBundle {
  final String content;
  _FakeAssetBundle(this.content);

  @override
  Future<String> loadString(String key, {bool cache = true}) async {
    if (key == 'assets/changelog.txt') return content;
    throw FlutterError('Asset not found: $key');
  }

  @override
  Future<ByteData> load(String key) async {
    throw FlutterError('Asset not found: $key');
  }
}

void main() {
  testWidgets('ChangeLogScreen renders changelog content', (tester) async {
    const fakeChangelog =
        '* 2026-01-01: Initial release\n* 2026-01-02: Bug fix';

    await tester.pumpWidget(
      DefaultAssetBundle(
        bundle: _FakeAssetBundle(fakeChangelog),
        child: const MaterialApp(home: ChangeLogScreen()),
      ),
    );
    await tester.pumpAndSettle();

    expect(find.text('ChangeLog'), findsOneWidget);
    expect(find.textContaining('2026-01-01'), findsOneWidget);
    expect(find.textContaining('Initial release'), findsOneWidget);
  });

  testWidgets('ChangeLogScreen shows error when asset is missing', (
    tester,
  ) async {
    await tester.pumpWidget(
      DefaultAssetBundle(
        bundle: _BadAssetBundle(),
        child: const MaterialApp(home: ChangeLogScreen()),
      ),
    );
    await tester.pumpAndSettle();

    expect(find.textContaining('Error loading changelog:'), findsOneWidget);
  });
}

class _BadAssetBundle extends Fake implements AssetBundle {
  @override
  Future<String> loadString(String key, {bool cache = true}) async {
    throw FlutterError('Unable to load asset: "$key"');
  }

  @override
  Future<ByteData> load(String key) async {
    throw FlutterError('Unable to load asset: "$key"');
  }
}