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Testing ​

Express se prueba bien separando app de listen y usando Supertest.

App testeable ​

js
export const app = express()
app.get('/health', healthHandler)

Servidor:

js
app.listen(3000)

Supertest ​

js
import request from 'supertest'
import { app } from '../src/app.js'

test('health', async () => {
  await request(app).get('/health').expect(200)
})

Tests de servicios ​

js
test('calculates total', () => {
  expect(calculateTotal([{ price: 10 }, { price: 20 }])).toBe(30)
})

Buenas practicas ​

  • Testea handlers y servicios.
  • Mockea clientes externos.
  • Usa base de test.
  • Cubre errores 400/401/403/404.
  • Ejecuta tests en CI.