axios-test-instance

import { createInstance, AxiosTestInstance } from 'axios-test-instance'; import express from 'express'; // 1. Set up a simple Express application for testing const app = express(); app.use(express.json()); // Middleware to parse JSON bodies app.get('/', (req, res) => { res.status(200).send('Hello from test app!'); }); app.post('/submit', (req, res) => { if (req.body && req.body.message) { return res.status(200).json({ received: req.body.message }); } res.status(400).send('Bad Request'); }); // 2. Declare a variable to hold the test instance let instance: AxiosTestInstance; describe('Axios Test Instance Integration', () => { // 3. Create the test instance before all tests beforeAll(async () => { instance = await createInstance(app); }); // 4. Close the test instance after all tests afterAll(async () => { await instance.close(); }); // 5. Write tests using the instance like a regular Axios client test('should handle GET requests correctly', async () => { const response = await instance.get('/'); expect(response.status).toBe(200); expect(response.data).toBe('Hello from test app!'); }); test('should handle POST requests with JSON body', async () => { const testPayload = { message: 'Greetings!' }; const response = await instance.post('/submit', testPayload); expect(response.status).toBe(200); expect(response.data).toEqual({ received: 'Greetings!' }); }); test('should return 400 for invalid POST payload', async () => { const response = await instance.post('/submit', {}); expect(response.status).toBe(400); expect(response.data).toBe('Bad Request'); }); });