e2e tests fail on server with selenium - selenium

Question

I'm about to create an application full js based on vuejs. Following https://github.com/vuejs-templates/webpack, I have started a project:
$ vue init webpack my-project && cd my-project && yarn install
When I run unittest yarn run unit everything goes well, but when I run yarn run e2e which runs nightwatch.js, I get this error:
> Starting dev server...
Starting to optimize CSS...
> Listening at http://localhost:8889
Starting selenium server... started - PID: 23451
started - PID: 23451
[Test] Test Suite
=====================
Running: default e2e tests
[client :: capabilities] Test Suite
=======================================
Error retrieving a new session from the selenium server
Connection refused! Is selenium server started?
{ Error: socket hang up
at createHangUpError (_http_client.js:344:15)
at Socket.socketOnEnd (_http_client.js:436:23)
at emitNone (events.js:110:20)
at Socket.emit (events.js:207:7)
at endReadableNT (_stream_readable.js:1047:12)
at _combinedTickCallback (internal/process/next_tick.js:102:11)
at process._tickCallback (internal/process/next_tick.js:161:9) code: 'ECONNRESET' }
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
The selenium server is started on the fly when the e2e tests start and is shutdown when they finish. I'm sure because when I stop nightwatch.js before it fails I see :
$ ps aux | grep -i selenium
java -Dwebdriver.chrome.driver=node_modules/chromedriver/lib/chromedriver/chromedriver -jar node_modules/selenium-server/lib/runner/selenium-server-standalone-2.53.1.jar -port 4444
So the real error based on the output I get is mostlikely Error retrieving a new session from the selenium server. How do I fix this?
package.json
"chromedriver": "^2.27.2",
"cross-spawn": "^5.0.1",
"nightwatch": "^0.9.12",
"selenium-server": "^2.53.1",
test/e2e/nightwatch.conf.js
require('babel-register')
var config = require('../../config')
// http://nightwatchjs.org/gettingstarted#settings-file
module.exports = {
src_folders: ['test/e2e/specs'],
output_folder: 'test/e2e/reports',
custom_assertions_path: ['test/e2e/custom-assertions'],
selenium: {
start_process: true,
server_path: require('selenium-server').path,
host: '127.0.0.1',
port: 4444,
cli_args: {
'webdriver.chrome.driver': require('chromedriver').path
}
},

Answer 1

I recently started a Vue.js project with Webpack template. Your problem sounds familiar, but surprisingly, I forgot how I solved it...
The only difference I can see between your package.json and mine is the selenium-server version (^3.0.1). You should also check your Node version because Nightwatch is based on it. I remember that I had to update Node and npm for some reason (I do not use Yarn).
This is my environment (and it is working fine):
Node.js (v8.1.3)
npm (5.0.3)

Answer 2

Did you run node nightwatch.config.js, or node {whatever your nightwatch config file is called}. This will install Selenium and ChromeDriver correctly.