feat(flutter): 重做品牌开屏动画

test/splash/splash_gate_test.dart

@@ -3,6 +3,7 @@
 import 'dart:async';
 
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:fruitshorts/core/data/models/drama.dart';
 import 'package:fruitshorts/core/data/models/home_feed.dart';
@@ -10,38 +11,66 @@ import 'package:fruitshorts/core/data/repositories/catalog_repository.dart';
 import 'package:fruitshorts/core/data/services/catalog_controller.dart';
 import 'package:fruitshorts/l10n/app_localizations.dart';
 import 'package:fruitshorts/pages/home/home_view.dart';
+import 'package:fruitshorts/pages/splash/splash_page.dart';
 import 'package:provider/provider.dart';
 
 void main() {
-  testWidgets(
-    'should_keep_splash_with_loading_until_home_feed_settles',
-    (tester) async {
-      final repository = _PendingCatalog();
-      await tester.pumpWidget(
-        MaterialApp(
-          localizationsDelegates: AppLocalizations.localizationsDelegates,
-          supportedLocales: AppLocalizations.supportedLocales,
-          home: ChangeNotifierProvider(
-            create: (_) => CatalogController(repository)..load(),
-            child: const HomePage(),
-          ),
+  testWidgets('should_keep_splash_with_loading_until_home_feed_settles', (
+    tester,
+  ) async {
+    final repository = _PendingCatalog();
+    await tester.pumpWidget(
+      MaterialApp(
+        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        supportedLocales: AppLocalizations.supportedLocales,
+        home: ChangeNotifierProvider(
+          create: (_) => CatalogController(repository)..load(),
+          child: const HomePage(),
         ),
-      );
+      ),
+    );
 
-      expect(find.byKey(const Key('splash-screen')), findsOneWidget);
-      expect(find.byKey(const Key('splash-loading')), findsOneWidget);
-      expect(find.byKey(const Key('home-empty')), findsNothing);
-      final clip = tester.widget<ClipRRect>(find.byType(ClipRRect));
-      expect(clip.borderRadius, BorderRadius.circular(18));
+    expect(find.byKey(const Key('splash-screen')), findsOneWidget);
+    expect(find.byKey(const Key('splash-loading')), findsOneWidget);
+    expect(find.byKey(const Key('home-empty')), findsNothing);
+    final clip = tester.widget<ClipRRect>(find.byType(ClipRRect));
+    expect(clip.borderRadius, BorderRadius.circular(24));
 
-      repository.pending.complete(const HomeFeed());
-      await tester.pump();
-      await tester.pump();
+    repository.pending.complete(const HomeFeed());
+    await tester.pump();
+    await tester.pump();
 
-      expect(find.byKey(const Key('splash-screen')), findsNothing);
-      expect(find.byKey(const Key('home-empty')), findsOneWidget);
-    },
-  );
+    expect(find.byKey(const Key('splash-screen')), findsNothing);
+    expect(find.byKey(const Key('home-empty')), findsOneWidget);
+  });
+
+  testWidgets('should_animate_brand_copy_and_loading_to_full_opacity', (
+    tester,
+  ) async {
+    await tester.pumpWidget(const MaterialApp(home: SplashPage()));
+
+    expect(find.byKey(const Key('splash-screen')), findsOneWidget);
+    expect(find.byKey(const Key('splash-brand')), findsOneWidget);
+    expect(find.byKey(const Key('splash-tagline')), findsOneWidget);
+    expect(find.byKey(const Key('splash-loading')), findsOneWidget);
+    expect(
+      tester.widget<ColoredBox>(find.byKey(const Key('splash-screen'))).color,
+      const Color(0xFF100C0A),
+    );
+    final overlay = tester.widget<AnnotatedRegion<SystemUiOverlayStyle>>(
+      find.byType(AnnotatedRegion<SystemUiOverlayStyle>).first,
+    );
+    expect(overlay.value.statusBarIconBrightness, Brightness.light);
+
+    await tester.pump(const Duration(milliseconds: 1200));
+
+    double opacity(String key) =>
+        tester.widget<FadeTransition>(find.byKey(Key(key))).opacity.value;
+    expect(opacity('splash-logo-fade'), 1);
+    expect(opacity('splash-brand-fade'), 1);
+    expect(opacity('splash-tagline-fade'), 1);
+    expect(opacity('splash-loading-fade'), 1);
+  });
 }
 
 class _PendingCatalog implements CatalogRepository {