Configuring for run test

app.js

@@ -2,13 +2,15 @@ const express = require('express');
 const dotenv = require('dotenv');
 const morgan = require('morgan');
 const { ApolloServer } = require('apollo-server-express');
+
 const typeDefs = require('./graphql/schema');
 const resolvers = require('./graphql/resolvers');
 const rateLimiter = require('./middlewares/rateLimiter');
 const csrf = require('csurf');
 const cookieParser = require('cookie-parser');
 const setupSwagger = require('./swagger');
 const compression = require('compression');
+const { getProductById } = require('./controllers/productController');
 
 dotenv.config();
 
@@ -19,6 +21,7 @@ app.use(morgan('dev'));
 app.use(rateLimiter);
 app.use(compression());
 const csrfProtection = csrf({ cookie: true });
+app.get('/api/v1/products/:id', getProductById);
 
 app.use((req, res, next) => {
   if (req.path === '/graphql') {

tests/productRoutes.test.js

@@ -2,25 +2,35 @@ const request = require('supertest');
 const app = require('../app');
 const Product = require('../models/Product');
 
+// Mock Product model
 jest.mock('../models/Product');
 
 describe('GET /api/v1/products/:id', () => {
+  afterEach(() => {
+    // Clear all mocks after each test to ensure no cross-test interference
+    jest.clearAllMocks();
+  });
+
   it('should return a product by id', async () => {
+    // Mock Product.findById to return a product
     Product.findById.mockResolvedValue({ _id: '123', name: 'Sample Product' });
 
     const res = await request(app).get('/api/v1/products/123');
 
+    // Ensure it returns status 200 and the correct product
     expect(res.statusCode).toEqual(200);
     expect(res.body).toHaveProperty('_id', '123');
     expect(res.body).toHaveProperty('name', 'Sample Product');
   });
 
   it('should return 404 if product is not found', async () => {
+    // Mock Product.findById to return null (product not found)
     Product.findById.mockResolvedValue(null);
 
     const res = await request(app).get('/api/v1/products/123');
 
+    // Ensure it returns status 404 and the correct error message
     expect(res.statusCode).toEqual(404);
-    expect(res.body).toHaveProperty('message', 'Product not found');
+    expect(res.body).toEqual({ message: 'Product not found' });
   });
 });