app.js

require('dotenv').config();
const lg = require('./libs/log');
const express = require('express');
const app = express();
const mainRouter = require('./libs/router');

app.use('/', mainRouter);
let port = process.env.WEB_PORT || 8080;
app.listen(port, function () {
    lg.debug('app listening on port %i!', port);
});

console

$ npm test

> backend-core@0.0.1 test C:\projects\freeswitch\backend-core-js
> mocha



[2018-10-15T00:00:40.719] [DEBUG] imager - app listening on port 8080!
  directory
    /GET directory
      1) should GET 200 ok 


  0 passing (24ms)
  1 failing

  1) directory
       /GET directory
         should GET 200 ok :
     TypeError: app.address is not a function
      at serverAddress (node_modules\chai-http\lib\request.js:282:18)
      at new Test (node_modules\chai-http\lib\request.js:271:53)
      at Object.obj.(anonymous function) [as get] (node_modules\chai-http\lib\request.js:239:14)
      at Context.it (test\directory.js:15:18)

libs\router\index.js

const express = require('express');
const router = express.Router();

//Тупо копипаста из примера, чтобы под рукой было

router.use(function timeLog(req, res, next) {
    console.log('Time: ', Date.now());
    next();
});

router.get('/', function(req, res) {
    res.send('Birds home page');
});

// define the about route
router.get('/about', function(req, res) {
    res.send('About birds');
});


module.exports = router;

test\directory.js

process.env.NODE_ENV = 'test';

let chai = require('chai');
let chaiHttp = require('chai-http');
let server = require('../app');
let should = chai.should();

chai.use(chaiHttp);


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