1

flutter_app/test/model_manager_test.dart

@@ -11,6 +11,13 @@ const _modelBytes = [1, 2, 3, 4, 5, 6, 7, 8];
 
 String _shaHex(List<int> bytes) => sha256.convert(bytes).toString();
 
+/// 分两段到达的下载流（中间 50ms 停顿，供取消测试在下载中触发）
+Stream<List<int>> _delayedChunks() async* {
+  yield [1, 2, 3, 4];
+  await Future<void>.delayed(const Duration(milliseconds: 50));
+  yield [5, 6, 7, 8];
+}
+
 Map<String, dynamic> _catalog(List<Map<String, dynamic>> models) => {
       'code': 0,
       'message': 'ok',
@@ -194,4 +201,36 @@ void main() {
     expect(broken.ready, isFalse);
     expect(broken.error, isNotNull);
   });
+
+  test('取消下载：中断后恢复未下载、不记错误', () async {
+    final m = manager(MockClient((req) async {
+      if (req.url.path == '/api/v1/app/update') {
+        return http.Response.bytes(
+            utf8.encode(jsonEncode(_catalog([_item()]))), 200);
+      }
+      if (req.url.path.startsWith('/download/models/')) {
+        downloadHits++;
+        return http.Response.fromStream(http.StreamedResponse(
+            _delayedChunks(), 200,
+            contentLength: _modelBytes.length));
+      }
+      return http.Response('not found', 404);
+    }));
+    await m.refresh();
+
+    final fut = m.downloadModel(m.catalog.first);
+    // 首个分块到达后取消（模拟用户在下载中点取消）
+    await Future<void>.delayed(const Duration(milliseconds: 20));
+    m.cancelDownload(7);
+    final ok = await fut;
+
+    expect(ok, isFalse);
+    expect(downloadHits, 1);
+    expect(m.isDownloaded(7), isFalse);
+    expect(m.isActive(7), isFalse);
+    expect(m.progressOf(7), isNull);
+    expect(m.errorOf(7), isNull, reason: '取消不记错误');
+    expect(await File('${root.path}/7/model.tflite.part').exists(), isFalse,
+        reason: '取消后 .part 残留应被清理');
+  });
 }