refactor: 使用flutter对原先的web项目重构，正在进行中

app/test/widget_test.dart

@@ -0,0 +1,12 @@
+// Smoke test for the IWBT-C Flutter port. The default counter-app test was
+// removed because the app root is `AppRoot` (see lib/src/app_root.dart), not the
+// boilerplate `MyApp`.
+import 'package:flutter_test/flutter_test.dart';
+import 'package:iwbtc/src/app_root.dart' show AppRoot;
+
+void main() {
+  testWidgets('AppRoot instantiates', (WidgetTester tester) async {
+    // Smoke check: the game root widget constructs without throwing.
+    expect(const AppRoot(), isA<AppRoot>());
+  });
+}