vitest Router.use() requires a middleware function but got a undefined

I am trying to unit test my router object in Express but inside the unit test file the object returns undefined

Here is a minimal version of my app

src/config/apiVersion.js

// update major versions here
const version = '/v2'

export default version

src/routes/index.js

import express from 'express'
import {
  healthRouter,
  healthUrl
} from './health/index.js'

const router = express.Router()

// add new routes here
const allRoutes = [
  {
    path: healthUrl,
    route: healthRouter
  }
]

// tell the router to use the routes you added
allRoutes.forEach((route) => {
  router.use(route.path, route.route)
})

export default router

src/routes/health/index.js

import express from 'express'
import { healthController } from '../../controllers/health/index.js'

const healthRouter = express.Router()

const healthUrl = '/health'

healthRouter.route('/')
  .get(healthController)

export {
  healthRouter,
  healthUrl
}

src/app.js (note I omitted most of the app.use's such as app.us(cors()) for example

// version is just the string '/v2'
import version from './config/apiVersion.js'
import router from './routes/index.js'

const app = express()

// some other app.use's here omitted like app.use(cors)

// add routes
app.use(`${version}`, router)

// custom 404 to handle non-existent paths/typos on paths
app.use((req, res) => {
  res.status(404).send({ error: 'Path does not exist, check for typos. If querying /soap you also need vendor and method in the path' })
})

// custom error handler
app.use((err, req, res) => {
  appLogger.error('There was an error: ' + err.stack)
  res.status(500).send('Something broke!')
})

export default app

Here is my test file

import router from '../../../src/routes/index.js'

// to make sure the number of routes doesn't change without a new test added
const actualNumberRoutes = 2

describe('router', () => {
  it('should return all the routes', () => {
    let numberOfRoutes = 0
    router.stack.forEach((layer) => {
      expect(layer.name).toEqual('router')
      numberOfRoutes += 1
    })
    expect(numberOfRoutes).toEqual(actualNumberRoutes)
  })
})

And the error for this file where router is coming up as undefined

Via Active questions tagged javascript - Stack Overflow https://ift.tt/eWqzl3f