feat(player): 重做播放页信息层级与互动栏点击动效

test/player/expandable_synopsis_test.dart

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+// Author: fruit.com.cn
+// 职责：验证共用简介的短文案、展开声明、内容更新与减少动画行为。
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/core/theme/app_theme.dart';
+import 'package:fruitshorts/l10n/app_localizations.dart';
+import 'package:fruitshorts/pages/player/widgets/expandable_synopsis.dart';
+
+const _width = 300.0;
+const _shortCopy = 'A short story.';
+const _longCopy =
+    'A hidden promise brings two families together after years apart. '
+    'Every secret leads them closer to an unexpected truth. '
+    'Their journey through the city changes everything they once believed.';
+const _toggle = Key('player-synopsis-more');
+const _expanded = Key('player-synopsis-expanded');
+const _collapsed = Key('player-synopsis');
+const _footer = Text('Author declaration', key: Key('test-author-note'));
+const _motionSample = Duration(milliseconds: 80);
+
+Future<void> _pump(
+  WidgetTester tester, {
+  String synopsis = _longCopy,
+  bool disableAnimations = false,
+}) async {
+  await tester.pumpWidget(
+    MaterialApp(
+      theme: AppTheme.dark(),
+      locale: const Locale('en'),
+      localizationsDelegates: AppLocalizations.localizationsDelegates,
+      supportedLocales: AppLocalizations.supportedLocales,
+      home: Builder(
+        builder: (context) => MediaQuery(
+          data: MediaQuery.of(
+            context,
+          ).copyWith(disableAnimations: disableAnimations),
+          child: Scaffold(
+            body: Align(
+              alignment: Alignment.bottomLeft,
+              child: SizedBox(
+                width: _width,
+                child: ExpandableSynopsis(
+                  synopsis: synopsis,
+                  keyPrefix: 'player',
+                  expandedFooter: _footer,
+                ),
+              ),
+            ),
+          ),
+        ),
+      ),
+    ),
+  );
+}
+
+void main() {
+  testWidgets('should_hide_toggle_when_synopsis_fits_two_lines', (
+    tester,
+  ) async {
+    await _pump(tester, synopsis: _shortCopy);
+    expect(find.byKey(_toggle), findsNothing);
+    expect(tester.widget<Text>(find.byKey(_collapsed)).maxLines, 2);
+    expect(find.byKey(_footer.key!), findsNothing);
+  });
+
+  testWidgets('should_render_no_copy_when_synopsis_is_empty', (tester) async {
+    await _pump(tester, synopsis: '');
+    expect(find.byKey(_collapsed), findsNothing);
+    expect(find.byKey(_toggle), findsNothing);
+    expect(find.byKey(_footer.key!), findsNothing);
+  });
+
+  testWidgets('should_only_show_author_note_when_synopsis_is_expanded', (
+    tester,
+  ) async {
+    await _pump(tester);
+    final toggle = find.byKey(_toggle);
+    final toggleRect = tester.getRect(toggle);
+    expect(find.byKey(_footer.key!), findsNothing);
+    await tester.tap(toggle);
+    await tester.pumpAndSettle();
+    expect(find.byKey(_expanded), findsOneWidget);
+    expect(find.byKey(_footer.key!), findsOneWidget);
+    expect(tester.getRect(toggle), toggleRect);
+    await tester.tap(toggle);
+    await tester.pumpAndSettle();
+    expect(find.byKey(_collapsed), findsOneWidget);
+    expect(find.byKey(_footer.key!), findsNothing);
+    expect(tester.getRect(toggle), toggleRect);
+  });
+
+  testWidgets('should_collapse_again_when_synopsis_changes', (tester) async {
+    await _pump(tester);
+    await tester.tap(find.byKey(_toggle));
+    await tester.pumpAndSettle();
+    expect(find.byKey(_expanded), findsOneWidget);
+    await _pump(tester, synopsis: '$_longCopy $_shortCopy');
+    await tester.pumpAndSettle();
+    expect(find.byKey(_expanded), findsNothing);
+    expect(find.byKey(_collapsed), findsOneWidget);
+    expect(find.byKey(_footer.key!), findsNothing);
+  });
+
+  testWidgets('should_toggle_immediately_when_animations_are_disabled', (
+    tester,
+  ) async {
+    await _pump(tester, disableAnimations: true);
+    await tester.pumpAndSettle();
+    expect(find.byKey(const Key('player-synopsis-size')), findsNothing);
+    await tester.tap(find.byKey(_toggle));
+    await tester.pump();
+    expect(find.byKey(_expanded), findsOneWidget);
+    expect(find.byKey(_footer.key!), findsOneWidget);
+    final expandedRect = tester.getRect(find.byKey(_expanded));
+    await tester.pump(_motionSample);
+    expect(tester.getRect(find.byKey(_expanded)), expandedRect);
+  });
+}