ReelShort/test/discover/cover_carousel_test.dart

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:fruitshorts/l10n/app_localizations.dart';
import 'package:fruitshorts/pages/discover/widgets/cover_carousel.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  List<CoverItem> items(int count) => [
    for (var index = 0; index < count; index++)
      CoverItem(
        title: 'Banner $index',
        subtitle: 'Subtitle $index',
        image: '/files/banner-$index.png',
        onOpen: _noop,
      ),
  ];

  testWidgets('should_turn_cube_and_keep_title_on_poster_when_carousel_pages', (
    tester,
  ) async {
    await tester.pumpWidget(
      _localizedApp(
        CoverCarousel(
          items: [
            for (final title in ['The Signal', 'City Lights', 'Vengeance'])
              CoverItem(
                title: title,
                subtitle: 'Mock',
                image: '/files/poster.png',
                onOpen: _noop,
              ),
          ],
        ),
      ),
    );
    await tester.pump();

    expect(find.text('The Signal'), findsOneWidget);
    expect(find.text('Mock'), findsOneWidget);

    final box = tester.getRect(find.byType(CoverCarousel));
    final gesture = await tester.startGesture(
      Offset(box.right - 40, box.center.dy),
    );
    await gesture.moveBy(const Offset(-500, 0));
    await tester.pump();

    final turned = tester
        .widgetList<Transform>(find.byType(Transform))
        .any((transform) => (transform.transform.entry(0, 0) - 1).abs() > 0.15);
    expect(turned, isTrue);

    await gesture.moveBy(const Offset(-200, 0));
    await gesture.up();
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 450));

    expect(find.text('City Lights'), findsOneWidget);
    expect(tester.takeException(), isNull);
  });

  testWidgets('should_auto_advance_and_show_dots_when_multiple_items_exist', (
    tester,
  ) async {
    await tester.pumpWidget(_localizedApp(CoverCarousel(items: items(3))));
    await tester.pump();

    expect(find.text('Banner 0'), findsOneWidget);
    expect(find.byKey(const Key('carousel-dot-0')), findsOneWidget);
    expect(find.byKey(const Key('carousel-dot-1')), findsOneWidget);
    expect(find.byKey(const Key('carousel-dot-2')), findsOneWidget);

    await tester.pump(const Duration(milliseconds: 4500));
    await tester.pump(const Duration(milliseconds: 500));

    expect(find.text('Banner 1'), findsOneWidget);
    await tester.pumpWidget(const SizedBox.shrink());
  });

  testWidgets('should_not_schedule_auto_advance_when_only_one_item_exists', (
    tester,
  ) async {
    await tester.pumpWidget(_localizedApp(CoverCarousel(items: items(1))));
    await tester.pump(const Duration(seconds: 12));

    expect(find.text('Banner 0'), findsOneWidget);
    expect(find.byKey(const Key('carousel-dot-0')), findsOneWidget);
    expect(find.byKey(const Key('carousel-dot-1')), findsNothing);
  });

  testWidgets('should_pause_auto_advance_while_pointer_is_down', (
    tester,
  ) async {
    await tester.pumpWidget(_localizedApp(CoverCarousel(items: items(3))));
    await tester.pump();
    final box = tester.getRect(find.byType(CoverCarousel));
    final gesture = await tester.startGesture(box.center);
    await tester.pump(const Duration(seconds: 6));

    expect(find.text('Banner 0'), findsOneWidget);

    await gesture.up();
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 4500));
    await tester.pump(const Duration(milliseconds: 500));

    expect(find.text('Banner 1'), findsOneWidget);
    await tester.pumpWidget(const SizedBox.shrink());
  });

  testWidgets('should_pause_when_inactive_and_resume_when_active_again', (
    tester,
  ) async {
    final active = ValueNotifier(false);
    await tester.pumpWidget(
      _localizedApp(
        ValueListenableBuilder<bool>(
          valueListenable: active,
          builder: (context, enabled, _) =>
              CoverCarousel(items: items(2), active: enabled),
        ),
      ),
    );
    await tester.pump(const Duration(seconds: 6));
    expect(find.text('Banner 0'), findsOneWidget);

    active.value = true;
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 4500));
    await tester.pump(const Duration(milliseconds: 500));
    expect(find.text('Banner 1'), findsOneWidget);
    await tester.pumpWidget(const SizedBox.shrink());
  });

  testWidgets('should_show_icon_fallback_when_banner_image_is_empty', (
    tester,
  ) async {
    await tester.pumpWidget(
      _localizedApp(
        CoverCarousel(
          items: const [
            CoverItem(
              title: 'Broken image',
              subtitle: '',
              image: '',
              onOpen: _noop,
            ),
          ],
        ),
      ),
    );
    await tester.pump();

    expect(find.byKey(const Key('carousel-image-fallback')), findsOneWidget);
  });

  testWidgets(
    'should_keep_existing_open_callback_when_active_poster_is_tapped',
    (tester) async {
      var opened = 0;
      await tester.pumpWidget(
        _localizedApp(
          CoverCarousel(
            items: [
              CoverItem(
                title: 'Tap me',
                subtitle: '',
                image: '/files/banner.png',
                onOpen: () => opened++,
              ),
              ...items(1),
            ],
          ),
        ),
      );
      await tester.pump();

      await tester.tap(find.text('Tap me'));
      expect(opened, 1);
      await tester.pumpWidget(const SizedBox.shrink());
    },
  );
}

void _noop() {}

Widget _localizedApp(Widget child) => MaterialApp(
  locale: const Locale('en'),
  localizationsDelegates: AppLocalizations.localizationsDelegates,
  supportedLocales: AppLocalizations.supportedLocales,
  home: Scaffold(body: child),
);