fix(flutter): 首页 feed 静默刷新与进度条细节

test/home/catalog_controller_refresh_test.dart

@@ -0,0 +1,72 @@
+// Author: fruit.com.cn
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/core/data/models/drama.dart';
+import 'package:fruitshorts/core/data/models/home_feed.dart';
+import 'package:fruitshorts/core/data/repositories/catalog_repository.dart';
+import 'package:fruitshorts/core/data/services/catalog_controller.dart';
+
+void main() {
+  test('should_keep_state_when_silent_refresh_fails', () async {
+    final repository = _FakeCatalog(fail: true);
+    final controller = CatalogController(repository);
+    const oldFeed = HomeFeed();
+    controller.feed = oldFeed;
+
+    final ok = await controller.refresh();
+
+    expect(ok, isFalse);
+    expect(controller.feed, same(oldFeed));
+    expect(controller.loading, isFalse);
+    expect(controller.error, isNull);
+  });
+
+  test(
+    'should_replace_feed_without_touching_loading_when_refresh_succeeds',
+    () async {
+      final repository = _FakeCatalog();
+      final controller = CatalogController(repository);
+      controller.feed = const HomeFeed();
+      final next = HomeFeed(
+        sections: [
+          FeedSection(code: 'new', title: 'New', dramas: const [_drama]),
+        ],
+      );
+      repository.next = next;
+
+      final ok = await controller.refresh();
+
+      expect(ok, isTrue);
+      expect(controller.feed, same(next));
+      expect(controller.loading, isFalse);
+      expect(controller.error, isNull);
+    },
+  );
+}
+
+class _FakeCatalog implements CatalogRepository {
+  _FakeCatalog({this.fail = false});
+
+  bool fail;
+  HomeFeed next = const HomeFeed();
+
+  @override
+  Future<HomeFeed> fetchHomeFeed() async {
+    if (fail) throw StateError('offline');
+    return next;
+  }
+
+  @override
+  Future<HomeFeed> fetchDiscoverFeed() async => const HomeFeed();
+
+  @override
+  Future<Drama> fetchDrama(String dramaId) async => _drama;
+}
+
+const _drama = Drama(
+  id: 'refresh-drama',
+  title: 'Refresh Drama',
+  synopsis: 'synopsis',
+  posterUrl: '',
+  detailLoaded: true,
+);