CODEWITHSUNDEEP
node.jsexpressmocha.js
randal
randal

Reputation: 1362

Uncaught Error: listen EADDRINUSE: address already in use :::3000 when mocha unit testing

I'm getting this error when unit testing code,

2 passing (14ms) 1 failing

1) Uncaught error outside test suite: Uncaught Error: listen EADDRINUSE: address already in use :::3000 at Server.setupListenHandle [as _listen2] (net.js:1255:14) at listenInCluster (net.js:1303:12) at Server.listen (net.js:1391:7) at Function.listen (node_modules/express/lib/application.js:618:24) at Object.listen (main.js:39:5) at Module._compile (internal/modules/cjs/loader.js:721:30) at Module._compile (node_modules/pirates/lib/index.js:99:24) at Module._extensions..js (internal/modules/cjs/loader.js:732:10) at Object.newLoader [as .js] (node_modules/pirates/lib/index.js:104:7) at Module.load (internal/modules/cjs/loader.js:620:32) at tryModuleLoad (internal/modules/cjs/loader.js:560:12) at Function.Module._load (internal/modules/cjs/loader.js:552:3) at Module.require (internal/modules/cjs/loader.js:657:17) at require (internal/modules/cjs/helpers.js:22:18) at Object. (test/main.test.js:4:1) at Module._compile (internal/modules/cjs/loader.js:721:30) at Module._compile (node_modules/pirates/lib/index.js:99:24) at Module._extensions..js (internal/modules/cjs/loader.js:732:10) at Object.newLoader [as .js] (node_modules/pirates/lib/index.js:104:7) at Module.load (internal/modules/cjs/loader.js:620:32) at tryModuleLoad (internal/modules/cjs/loader.js:560:12) at Function.Module._load (internal/modules/cjs/loader.js:552:3) at Module.require (internal/modules/cjs/loader.js:657:17) at require (internal/modules/cjs/helpers.js:22:18) at Array.forEach () at StatWatcher.onchange (internal/fs/watchers.js:50:8)

I'm using mocha, and i have --watch on my package.json. I'm using an es6 approach to express.

Package.json

{
  "name": "elies6express",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "./node_modules/.bin/mocha --watch --require @babel/register",
    "start": "nodemon --exec babel-node main.js"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "body-parser": "^1.19.0",
    "bookshelf": "^0.14.2",
    "chai-http": "^4.3.0",
    "cookie-parser": "^1.4.4",
    "cors": "^2.8.5",
    "dotenv": "^8.0.0",
    "express": "^4.17.0",
    "knex": "^0.16.5",
    "morgan": "^1.9.1",
    "path": "^0.12.7",
    "pg": "^7.11.0"
  },
  "devDependencies": {
    "@babel/cli": "^7.4.4",
    "@babel/core": "^7.4.5",
    "@babel/node": "^7.4.5",
    "@babel/preset-env": "^7.4.5",
    "@babel/register": "^7.4.4",
    "chai": "^4.2.0",
    "mocha": "^6.1.4",
    "nodemon": "^1.19.0",
    "reify": "^0.19.1",
    "request": "^2.88.0"
  }
}

main.js

import 'dotenv/config';
import cors from 'cors';
import express from 'express';
import logger from 'morgan';
import path from 'path';
import bodyParser from 'body-parser';
import cookieParser from 'cookie-parser';
import userRoute from './routes/users';

const app = express();

app.use(cors());
app.use(logger('dev'));
// For React Stuff if need be
// app.use(express.static(path.join(__dirname, 'public')));
app.use(express.static(path.join(__dirname, 'build')));
app.use(cookieParser());
app.use(bodyParser.json());

app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.use('/users', userRoute);

app.use(() => (req, res, next)  =>{
  res.locals.user = req.user; // This is the important line
  // req.session.user = user
  console.log(res.locals.user);
  next();
});
app.use(bodyParser.urlencoded({ extended:false})); 

//build mode
// app.get('*', (req, res) => {
//   res.sendFile(path.join(__dirname+'/client/public/index.html'));
// })

app.listen(process.env.PORT, () =>
  console.log(`Example app listening on port ${process.env.PORT}!`),
);

export default app;

main.test.js

import chai from "chai"
import chaiHttp from 'chai-http';
import request from 'request';
import server from '../main';
const expect = chai.expect;
const should = chai.should();


chai.use(chaiHttp);

// should get / 

describe('should GET /',  () => {
    it('should get 200 status', (done) =>{
        chai.request(server)
        .get('/')
        .end( (err, res) => {
            res.should.have.status(200);
            done();
        });
    });

})
// should check for Hello World!
describe('Should check for Hello World! text', () => {
    it('should check for hello world text', (done) =>{
        chai.request(server)
        .get('/')
        .end( (err, res) => {
            expect(res.body).to.be.an('object') // works
            expect(res.text).to.equal('Hello World!')  // use res.text to check for res.send() text
            done();
        })
    })

})

Upvotes: 4

Views: 10066

Answers (5)

user16197389
user16197389

Reputation:

The earlier linked

if (!module.parent) {

is deprecated as of v14.6.0, v12.19.0. (documentation link)

One solution is to use the following:

if (require.main === module) {

Upvotes: 5

ccoutinho
ccoutinho

Reputation: 4566

This looks very hacky, but what worked for me was making sure that, for every suite of tests, I would be using a different port.

Upvotes: 0

vijay
vijay

Reputation: 11027

"testwatch": "nodemon --exec \"mocha --recursive\""

will 100% server your purpose until test library posts something more relevant

Upvotes: 0

LexH
LexH

Reputation: 1147

In main.js, place your app.listen call inside a test for !module.parent, like this:

if(!module.parent){
  app.listen(process.env.PORT, () =>
    console.log(`Example app listening on port ${process.env.PORT}!`),
  );
}

Source: http://www.marcusoft.net/2015/10/eaddrinuse-when-watching-tests-with-mocha-and-supertest.html

Upvotes: 8

Sayantan Mukherjee
Sayantan Mukherjee

Reputation: 168

It means that something is running on port 3000 already. You need to stop that and then start your application. Or just change the port of your application to something else.

To free up port 3000 use :

fuser -k 3000/tcp

or

kill $(sudo lsof -t -i:3000)

To change the port of your application : 

var port = 8000;
app.listen(port, () =>
  console.log(`Example app listening on port ${port}!`),
);

Upvotes: -1

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