Selenium/Ruby/Target MediaWiki-Vagrant virtual machine

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 3 minutes on my machine.
 * It takes about 6-7 minutes for selenium-Core Jenkins job to run.
 * After everything is set up, you do not need internet connection.
 * Debugging failed tests will be easier, since you will see the browser.
 * 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 MediaWiki-Vagrant, Selenium and their dependencies on your machine.
 * While the tests are running the host machine will be pretty unusable because Firefox will be opening and closing for every test and stealing focus.

Set up MediaWiki-Vagrant

 * Follow instructions at MediaWiki-Vagrant.

Install dependencies
You will need internet access for this step. Depending on your operating system, installing dependencies will be different.

Firefox
Install Firefox 47.0.1. (We are working on adding support for newer versions.)

Ruby
Installing Ruby might be easier, or harder.


 * On Linux, please use appropriate package manager.
 * On Windows, please use RubyInstaller.
 * It should already installed on Mac machines.

After installation, check if everything is all right.

Install required Ruby packages (gems).

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