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Add unit tests
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‎lib/features/roadster/widget/app_bar/image_carousel.dart‎

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@@ -57,6 +57,7 @@ class ImageCarousel extends StatelessWidget {
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@override
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Widget build(BuildContext context) {
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return Transform.translate(
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key: const Key('parallax_transform'),
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offset: Offset(0, scrollOffset * 0.5),
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child: SizedBox(
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height: 300,

‎test/features/roadster/roadster_detail_screen.dart‎

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import 'dart:io';
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import 'package:flutter/material.dart';
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import 'package:flutter_bloc_app_template/app/localization.dart';
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import 'package:flutter_bloc_app_template/features/roadster/roadster_screen.dart';
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import 'package:flutter_bloc_app_template/features/roadster/widget/app_bar/roadster_app_bar.dart';
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import 'package:flutter_bloc_app_template/features/roadster/widget/background/animated_gradient_background.dart';
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import 'package:flutter_bloc_app_template/features/roadster/widget/background/animated_stars_field.dart';
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import 'package:flutter_bloc_app_template/features/roadster/widget/buttons/track_live_button.dart';
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import 'package:flutter_bloc_app_template/features/roadster/widget/roadster_content.dart';
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import 'package:flutter_bloc_app_template/models/roadster/roadster_resource.dart';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:network_image_mock/network_image_mock.dart';
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import '../../repository/roadster_repository_test.dart';
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void main() {
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late RoadsterResource mockRoadster;
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late List<String> mockImages;
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setUpAll(() => HttpOverrides.global = null);
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setUp(() {
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mockRoadster = mockRoadsterResource;
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mockImages = ['image1.jpg', 'image2.jpg'];
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});
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testWidgets('renders main sections and background', (tester) async {
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await mockNetworkImagesFor(
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() => tester.pumpWidget(
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MaterialApp(
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supportedLocales: appSupportedLocales,
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localizationsDelegates: appLocalizationsDelegates,
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home: RoadsterDetailScreen(
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roadster: mockRoadster,
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images: mockImages,
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),
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),
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),
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);
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// Animated background
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expect(find.byType(AnimatedGradientBackground), findsOneWidget);
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expect(find.byType(AnimatedStarsField), findsOneWidget);
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// Roadster content
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expect(find.byType(RoadsterAppBar), findsOneWidget);
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expect(find.byType(RoadsterContent), findsOneWidget);
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// Floating button
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expect(find.byType(TrackLiveButton), findsOneWidget);
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});
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}

‎test/features/roadster/widget/app_bar/image_carousel_test.dart‎

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import 'package:flutter/material.dart';
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import 'package:flutter_bloc_app_template/app/localization.dart';
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import 'package:flutter_bloc_app_template/features/roadster/widget/app_bar/image_carousel.dart';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:network_image_mock/network_image_mock.dart';
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void main() {
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group('ImageCarousel', () {
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late PageController pageController;
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late List<String> mockImages;
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var pageChangedCallCount = 0;
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setUp(() {
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pageController = PageController(viewportFraction: 0.85);
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mockImages = ['image1.jpg', 'image2.jpg', 'image3.jpg'];
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pageChangedCallCount = 0;
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});
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tearDown(() {
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pageController.dispose();
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});
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testWidgets('should render page view with images',
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(WidgetTester tester) async {
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await mockNetworkImagesFor(
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() => tester.pumpWidget(
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MaterialApp(
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supportedLocales: appSupportedLocales,
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localizationsDelegates: appLocalizationsDelegates,
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home: ImageCarousel(
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images: mockImages,
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pageController: pageController,
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scrollOffset: 0.0,
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onPageChanged: (index) => pageChangedCallCount++,
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),
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),
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),
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);
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expect(find.byType(PageView), findsOneWidget);
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expect(find.byType(Card), findsAtLeastNWidgets(1));
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});
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testWidgets('should apply parallax offset', (WidgetTester tester) async {
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const scrollOffset = 100.0;
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await mockNetworkImagesFor(
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() => tester.pumpWidget(
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MaterialApp(
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supportedLocales: appSupportedLocales,
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localizationsDelegates: appLocalizationsDelegates,
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home: ImageCarousel(
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images: mockImages,
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pageController: pageController,
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scrollOffset: scrollOffset,
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onPageChanged: (index) => pageChangedCallCount++,
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),
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),
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),
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);
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final transform =
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tester.widget<Transform>(find.byKey(const Key('parallax_transform')));
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expect(
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transform.transform.getTranslation().y, equals(scrollOffset * 0.5));
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});
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testWidgets('should call onPageChanged when swiping',
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(WidgetTester tester) async {
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pageChangedCallCount = 0;
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pageController = PageController(initialPage: 0);
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await mockNetworkImagesFor(() async {
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await tester.pumpWidget(
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MaterialApp(
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supportedLocales: appSupportedLocales,
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localizationsDelegates: appLocalizationsDelegates,
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home: ImageCarousel(
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images: mockImages,
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pageController: pageController,
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scrollOffset: 0.0,
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onPageChanged: (index) => pageChangedCallCount++,
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),
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),
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);
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// Wait for layout to stabilize
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await tester.pumpAndSettle();
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// Drag by the width of the page to trigger page change
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await tester.drag(find.byType(PageView), const Offset(-400, 0));
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await tester.pumpAndSettle();
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expect(pageChangedCallCount, greaterThan(0));
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});
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});
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});
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}

‎test/features/roadster/widget/app_bar/roadster_app_bar_test.dart‎

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import 'package:flutter/material.dart';
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import 'package:flutter_bloc_app_template/app/localization.dart';
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import 'package:flutter_bloc_app_template/features/roadster/widget/app_bar/image_carousel.dart';
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import 'package:flutter_bloc_app_template/features/roadster/widget/app_bar/image_indicators.dart';
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import 'package:flutter_bloc_app_template/features/roadster/widget/app_bar/roadster_app_bar.dart';
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import 'package:flutter_bloc_app_template/models/roadster/roadster_resource.dart';
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import 'package:flutter_test/flutter_test.dart' hide TestVSync;
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import 'package:network_image_mock/network_image_mock.dart';
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import '../../helpers/test_helpers.dart';
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void main() {
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group('RoadsterAppBar', () {
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late RoadsterResource mockRoadster;
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late List<String> mockImages;
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late AnimationController fadeController;
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setUp(() {
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mockRoadster = createMockRoadster();
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mockImages = ['image1.jpg', 'image2.jpg', 'image3.jpg'];
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fadeController = AnimationController(
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duration: const Duration(milliseconds: 1500),
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vsync: const TestVSync(),
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);
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});
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tearDown(() {
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fadeController.dispose();
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});
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testWidgets('should render sliver app bar', (WidgetTester tester) async {
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await mockNetworkImagesFor(
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() => tester.pumpWidget(
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MaterialApp(
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supportedLocales: appSupportedLocales,
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localizationsDelegates: appLocalizationsDelegates,
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home: Scaffold(
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body: CustomScrollView(
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slivers: [
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RoadsterAppBar(
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roadster: mockRoadster,
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images: mockImages,
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scrollOffset: 0.0,
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fadeController: fadeController,
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),
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],
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),
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),
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),
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),
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);
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expect(find.byType(SliverAppBar), findsOneWidget);
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});
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testWidgets('should show title when scrolled', (WidgetTester tester) async {
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await mockNetworkImagesFor(
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() => tester.pumpWidget(
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MaterialApp(
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supportedLocales: appSupportedLocales,
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localizationsDelegates: appLocalizationsDelegates,
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home: Scaffold(
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body: CustomScrollView(
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slivers: [
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RoadsterAppBar(
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roadster: mockRoadster,
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images: mockImages,
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scrollOffset: 250.0, // Scrolled past threshold
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fadeController: fadeController,
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),
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],
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),
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),
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),
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),
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);
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expect(find.text('Tesla Roadster'), findsAtLeast(1));
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});
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testWidgets('should hide title when not scrolled',
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(WidgetTester tester) async {
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await mockNetworkImagesFor(
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() => tester.pumpWidget(
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MaterialApp(
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supportedLocales: appSupportedLocales,
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localizationsDelegates: appLocalizationsDelegates,
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home: Scaffold(
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body: CustomScrollView(
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slivers: [
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RoadsterAppBar(
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roadster: mockRoadster,
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images: mockImages,
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scrollOffset: 0.0, // Not scrolled
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fadeController: fadeController,
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),
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],
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),
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),
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),
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),
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);
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// Title should be transparent
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final animatedOpacity = tester.widget<AnimatedOpacity>(
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find.byType(AnimatedOpacity),
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);
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expect(animatedOpacity.opacity, equals(0.0));
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});
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testWidgets('should start auto scroll for multiple images',
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(WidgetTester tester) async {
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await mockNetworkImagesFor(
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() => tester.pumpWidget(
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MaterialApp(
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supportedLocales: appSupportedLocales,
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localizationsDelegates: appLocalizationsDelegates,
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home: Scaffold(
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body: CustomScrollView(
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slivers: [
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RoadsterAppBar(
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roadster: mockRoadster,
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images: mockImages,
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scrollOffset: 0.0,
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fadeController: fadeController,
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),
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],
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),
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),
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),
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),
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);
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expect(find.byType(ImageCarousel), findsOneWidget);
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expect(find.byType(ImageIndicators), findsOneWidget);
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});
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testWidgets('should dispose controllers properly',
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(WidgetTester tester) async {
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await mockNetworkImagesFor(
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() => tester.pumpWidget(
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MaterialApp(
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supportedLocales: appSupportedLocales,
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localizationsDelegates: appLocalizationsDelegates,
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home: Scaffold(
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body: CustomScrollView(
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slivers: [
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RoadsterAppBar(
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roadster: mockRoadster,
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images: mockImages,
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scrollOffset: 0.0,
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fadeController: fadeController,
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),
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],
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),
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),
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),
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),
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);
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// Remove the widget to trigger dispose
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await tester.pumpWidget(const MaterialApp(home: Scaffold()));
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// Verify no errors occurred during disposal
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expect(tester.takeException(), isNull);
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});
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});
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}

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