TDD 작성

mobile/lib/services/notification_service.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import 'package:timezone/timezone.dart' as tz;
 import 'package:timezone/data/latest.dart' as tz_data;
@@ -8,14 +9,23 @@ import '../models/event_model.dart';
 class NotificationService {
   static NotificationService _instance = NotificationService._internal();
   factory NotificationService() => _instance;
-  NotificationService._internal();
+  
+  // 생성자에서 플러그인을 주입받을 수 있도록 변경
+  NotificationService._internal([FlutterLocalNotificationsPlugin? plugin])
+      : _notificationsPlugin = plugin ?? FlutterLocalNotificationsPlugin();
   
   // 테스트용 인스턴스 설정 메서드
   static void setTestInstance(NotificationService instance) {
     _instance = instance;
   }
+  
+  // 테스트용 인스턴스 생성 포함한 새 메서드
+  @visibleForTesting
+  static NotificationService createTestInstance(FlutterLocalNotificationsPlugin mockPlugin) {
+    return NotificationService._internal(mockPlugin);
+  }
 
-  final FlutterLocalNotificationsPlugin _notificationsPlugin = FlutterLocalNotificationsPlugin();
+  final FlutterLocalNotificationsPlugin _notificationsPlugin;
   bool _isInitialized = false;
 
   // 알림 서비스 초기화