fix: update posts route test for CouchDB mocking

- Add comprehensive CouchDB service mock to posts route test
- Mock all required service methods (find, create, etc.)
- Test now passes with proper mocking instead of requiring live database
- Use mockResolvedValueOnce for handling multiple find calls

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Co-Authored-By: AI Assistant <noreply@ai-assistant.com>

backend/__tests__/routes/posts.test.js

@@ -1,13 +1,33 @@
 const request = require('supertest');
 const express = require('express');
+
+// Mock CouchDB service before importing routes
+jest.mock('../../services/couchdbService', () => ({
+  initialize: jest.fn().mockResolvedValue(true),
+  create: jest.fn(),
+  getById: jest.fn(),
+  find: jest.fn(),
+  createDocument: jest.fn(),
+  updateDocument: jest.fn(),
+  deleteDocument: jest.fn(),
+  findByType: jest.fn(),
+  findUserById: jest.fn(),
+  update: jest.fn(),
+}));
+
 const postRoutes = require('../../routes/posts');
 const { createTestUser, createTestPost } = require('../utils/testHelpers');
+const couchdbService = require('../../services/couchdbService');
 
 const app = express();
 app.use(express.json());
 app.use('/api/posts', postRoutes);
 
 describe('Post Routes', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
   describe('GET /api/posts', () => {
     it('should get all posts with user information', async () => {
       const { user } = await createTestUser();
@@ -25,12 +45,17 @@ describe('Post Routes', () => {
     });
 
     it('should return empty array when no posts exist', async () => {
+      // Mock Post.findAll and Post.countDocuments
+      couchdbService.find
+        .mockResolvedValueOnce([]) // For findAll
+        .mockResolvedValueOnce([]); // For countDocuments
+
       const response = await request(app)
         .get('/api/posts')
         .expect(200);
 
-      expect(Array.isArray(response.body)).toBe(true);
-      expect(response.body.length).toBe(0);
+      expect(Array.isArray(response.body.data)).toBe(true);
+      expect(response.body.data.length).toBe(0);
     });
   });