You will need to have Node.js and NPM installed on your machine. Check out their project websites for more instructions. If you want to have WebdriverIO integrated into your test suite, then install it locally with:

$ npm install webdriverio --save-dev

The test runner is called wdio and should be available after the install was successful:

$ ./node_modules/.bin/wdio --help

Set up your Selenium environment

There are two ways of setting up your Selenium environment: as a standalone package or by installing the server and browser driver separately.

Use of existing standalone package

The simplest way to get started is to use one of the NPM selenium standalone packages like: vvo/selenium-standalone. After installing it (globally) you can run your server by executing:

$ selenium-standalone start

To install the Selenium Server and Chromedriver (if necessary) separately:

First you must run a selenium standalone server on your machine. You will get the newest version here. Just download the jar file somewhere on your system. After that start your terminal and execute the file via

$ java -jar /your/download/directory/selenium-server-standalone-2.42.2.jar

The standalone server comes with some integrated drivers (for Firefox, Opera and Safari) which enhance your installed browser to get navigated through the server by the JSONWire protocol.

Setup Chromedriver

Chromedriver is a standalone server which implements WebDriver’s wire protocol for Chromium. It is being developed by members of the Chromium and WebDriver teams. For running Chrome browser tests on your local machine you need to download ChromeDriver from the project website and make it available on your machine by setting the PATH to the ChromeDriver executable.