tdd 진행

mobile/lib/services/club_service.dart

@@ -12,7 +12,13 @@ class ClubService with ChangeNotifier {
   Club? _currentClub;
   bool _isLoading = false;
   String? _token;
-  final ApiService _apiService = ApiService();
+  ApiService _apiService;
+  
+  // 기본 생성자
+  ClubService() : _apiService = ApiService();
+  
+  // 테스트용 생성자
+  ClubService.forTest(this._apiService);
 
   List<Club> get clubs => [..._clubs];
   Club? get currentClub => _currentClub;