feat: 优化项目目录结构

apps/backend/src/notification/notification.service.spec.ts

@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { NotificationService } from './notification.service';
+
+describe('NotificationService', () => {
+  let service: NotificationService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [NotificationService],
+    }).compile();
+
+    service = module.get<NotificationService>(NotificationService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});