382 Viewed post data added to users in mongo db database

src/api/__test__/addRecentlyViewedTest.js

@@ -0,0 +1,138 @@
+//Use jest to test code!
+import express from 'express';
+import User from '../model/user.js';
+import cloudinary from '../config/cloudinary.js';
+
+const request = require('supertest');
+const express = require('express');
+const mongoose = require('mongoose');
+const router = express.Router();
+const User = require('./model/user.js');
+
+jest.mock('./model/user.js'); // Mock the User model
+
+const app = express();
+app.use(express.json());
+app.use(router);
+
+describe('/user/:userId/viewed-post API', () => {
+   afterEach(() => {
+      jest.clearAllMocks();
+   });
+
+   test('should return 404 if user does not exist', async () => {
+      User.findById.mockResolvedValue(null);
+
+      const response = await request(app)
+         .post('/user/123/viewed-post')
+         .send({ postId: '456' });
+
+      expect(response.status).toBe(404);
+      expect(response.body).toEqual({ message: 'User not found' });
+   });
+
+   test('should return 200 if the post was already viewed last', async () => {
+      const mockUser = {
+         _id: new mongoose.Types.ObjectId(),
+         viewed: [new mongoose.Types.ObjectId('507f191e810c19729de860ea')],
+         save: jest.fn(),
+      };
+      User.findById.mockResolvedValue(mockUser);
+
+      const response = await request(app)
+         .post(`/user/${mockUser._id}/viewed-post`)
+         .send({ postId: '507f191e810c19729de860ea' });
+
+      expect(response.status).toBe(200);
+      expect(response.body).toEqual({
+         message: 'Post already viewed right before!',
+      });
+   });
+
+   test('should move a re-viewed post to the front', async () => {
+      const mockUser = {
+         _id: new mongoose.Types.ObjectId(),
+         viewed: [
+            new mongoose.Types.ObjectId('507f191e810c19729de860eb'),
+            new mongoose.Types.ObjectId('507f191e810c19729de860ea'),
+         ],
+         save: jest.fn(),
+      };
+      User.findById.mockResolvedValue(mockUser);
+
+      const response = await request(app)
+         .post(`/user/${mockUser._id}/viewed-post`)
+         .send({ postId: '507f191e810c19729de860ea' });
+
+      expect(mockUser.viewed).toEqual([
+         new mongoose.Types.ObjectId('507f191e810c19729de860ea'),
+         new mongoose.Types.ObjectId('507f191e810c19729de860eb'),
+      ]);
+      expect(response.status).toBe(200);
+      expect(response.body).toEqual({
+         message: 'Viewed Post added successfully',
+      });
+   });
+
+   test('should add a new post to the viewed array', async () => {
+      const mockUser = {
+         _id: new mongoose.Types.ObjectId(),
+         viewed: [new mongoose.Types.ObjectId('507f191e810c19729de860eb')],
+         save: jest.fn(),
+      };
+      User.findById.mockResolvedValue(mockUser);
+
+      const response = await request(app)
+         .post(`/user/${mockUser._id}/viewed-post`)
+         .send({ postId: '507f191e810c19729de860ea' });
+
+      expect(mockUser.viewed).toEqual([
+         new mongoose.Types.ObjectId('507f191e810c19729de860eb'),
+         new mongoose.Types.ObjectId('507f191e810c19729de860ea'),
+      ]);
+      expect(mockUser.save).toHaveBeenCalled();
+      expect(response.status).toBe(200);
+      expect(response.body).toEqual({
+         message: 'Viewed Post added successfully',
+      });
+   });
+
+   test('should cap the viewed array to maxViewedPostSpace', async () => {
+      const maxViewedPostSpace = 2;
+      const mockUser = {
+         _id: new mongoose.Types.ObjectId(),
+         viewed: [
+            new mongoose.Types.ObjectId('507f191e810c19729de860eb'),
+            new mongoose.Types.ObjectId('507f191e810c19729de860ea'),
+         ],
+         save: jest.fn(),
+      };
+      User.findById.mockResolvedValue(mockUser);
+
+      const response = await request(app)
+         .post(`/user/${mockUser._id}/viewed-post`)
+         .send({ postId: '507f191e810c19729de860ec' });
+
+      expect(mockUser.viewed).toHaveLength(maxViewedPostSpace);
+      expect(mockUser.viewed).toEqual([
+         new mongoose.Types.ObjectId('507f191e810c19729de860ea'),
+         new mongoose.Types.ObjectId('507f191e810c19729de860ec'),
+      ]);
+      expect(mockUser.save).toHaveBeenCalled();
+      expect(response.status).toBe(200);
+      expect(response.body).toEqual({
+         message: 'Viewed Post added successfully',
+      });
+   });
+
+   test('should return 500 on server error', async () => {
+      User.findById.mockRejectedValue(new Error('Database error'));
+
+      const response = await request(app)
+         .post('/user/123/viewed-post')
+         .send({ postId: '456' });
+
+      expect(response.status).toBe(500);
+      expect(response.body).toEqual({ message: 'Server error' });
+   });
+});