userfront tests 수정

userfront/test/widget_test.dart

@@ -1 +1,10 @@
 // THIS FILE IS INTENTIONALLY LEFT BLANK TO AVOID WEB-RELATED TEST FAILURES IN CI
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('smoke test', (tester) async {
+    await tester.pumpWidget(const MaterialApp(home: SizedBox()));
+    expect(find.byType(SizedBox), findsOneWidget);
+  });
+}