feat(app): 接入首页轮播 banner

test/home/feed_banner_carousel_test.dart

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+// Author: fruit.com.cn
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/core/data/models/home_feed.dart';
+import 'package:fruitshorts/l10n/app_localizations.dart';
+import 'package:fruitshorts/pages/discover/widgets/feed_banner_carousel.dart';
+
+void main() {
+  testWidgets('should_render_nothing_when_banner_list_is_empty', (
+    tester,
+  ) async {
+    await _pump(tester, const []);
+
+    expect(find.byKey(const Key('feed-banner-carousel')), findsNothing);
+  });
+
+  testWidgets('should_open_linked_drama_when_banner_is_tapped', (tester) async {
+    FeedBanner? opened;
+    await _pump(tester, const [
+      FeedBanner(
+        id: 'banner-1',
+        imageUrl: '/files/banner.jpg',
+        linkType: 'DRAMA',
+        linkValue: 'drama-1',
+      ),
+    ], onOpen: (banner) => opened = banner);
+
+    expect(find.byKey(const Key('feed-banner-carousel')), findsOneWidget);
+    expect(find.byKey(const Key('feed-banner-0')), findsOneWidget);
+    await tester.tap(find.byKey(const Key('feed-banner-0')));
+    await tester.pump();
+
+    expect(opened?.dramaId, 'drama-1');
+  });
+
+  testWidgets('should_advance_to_next_banner_when_interval_elapses', (
+    tester,
+  ) async {
+    await _pump(tester, _banners);
+
+    await tester.pump(const Duration(milliseconds: 4600));
+    await tester.pumpAndSettle();
+
+    expect(_page(tester), 1);
+  });
+
+  testWidgets('should_pause_auto_advance_when_pointer_is_held', (tester) async {
+    await _pump(tester, _banners);
+    final gesture = await tester.startGesture(
+      tester.getCenter(find.byKey(const Key('feed-banner-carousel'))),
+    );
+
+    await tester.pump(const Duration(seconds: 5));
+    expect(_page(tester), 0);
+
+    await gesture.up();
+    await tester.pump(const Duration(seconds: 5));
+    await tester.pumpAndSettle();
+    expect(_page(tester), 1);
+  });
+}
+
+const _banners = [
+  FeedBanner(id: 'banner-1', imageUrl: '/files/one.jpg'),
+  FeedBanner(id: 'banner-2', imageUrl: '/files/two.jpg'),
+];
+
+double _page(WidgetTester tester) =>
+    tester.widget<PageView>(find.byType(PageView)).controller!.page!;
+
+Future<void> _pump(
+  WidgetTester tester,
+  List<FeedBanner> banners, {
+  ValueChanged<FeedBanner>? onOpen,
+}) async {
+  await tester.pumpWidget(
+    MaterialApp(
+      locale: const Locale('en'),
+      localizationsDelegates: AppLocalizations.localizationsDelegates,
+      supportedLocales: AppLocalizations.supportedLocales,
+      home: Scaffold(
+        body: FeedBannerCarousel(banners: banners, onOpen: onOpen ?? (_) {}),
+      ),
+    ),
+  );
+  await tester.pump();
+}