Selenium/How-to/Run tests targeting MediaWiki-Vagrant

For this example, we will not enable any roles and we will use MediaWiki Core.

Advantages
Running Selenium tests targeting MediaWiki-Vagrant machine has several advantages:


 * It will be fast, since the target machine is local. MediaWiki Core Selenium test run takes about 2 minutes on my machine. (As of September 2019.)
 * After everything is set up, you do not need internet connection.
 * Debugging failed tests will be easier, since you are able to see the browser. See Selenium/How-to/Make the browser visible.
 * You are probably already familiar with MediaWiki-Vagrant and have it installed.

Disadvantages

 * You might not be familiar with MediaWiki-Vagrant, so you will have to learn how to install and use yet another tool.
 * You will have to install Vagrant, MediaWiki-Vagrant and their dependencies on your machine.
 * You will be executing over 900 JavaScript packages (as of August 2019) directly on your machine with access to all personal/work files.

Set up MediaWiki-Vagrant

 * Follow instructions at MediaWiki-Vagrant.

Install dependencies
Depending on your operating system, installing dependencies will be different.

Chrome

 * Install Chrome.

Node.js

 * Install Node.js.
 * Install required npm packages.

Environment variables
Ensure the following environment variables are set. Either run this manually from the terminal or, to make it easier for next time, set them from shell configuration file (, ...) which means the variables are always available from any terminal session:

If you prefer, you can create an  file instead, with this contents.

or the machine
or