This is a temporary residence for the PHPUnit Example for Drupal 8.
Once a few blocking issues are resolved, this module will find its way soon into Drupal's Examples for Developers Project: https://drupal.org/project/examples
This module also exists as a patch on the Examples project issue queue: https://drupal.org/node/2032697
I created this github repo version of this module to support a session I'm giving at the Pacific Northwest Drupal Summit, and potentially BADCamp. Here's the page for that talk: http://2013.pnwdrupalsummit.org/sessions/phpunit-and-drupal-8-no-unit-left-behind
There are a couple of issues about Drupal and contributed modules at the moment.
One is that PHPUnit isn't properly configured to find tests in module subfolders under /module. That issue lives here: https://drupal.org/node/2056607
Another is that Drupal doesn't properly autoload classes from contrib modules. That issue is here: https://drupal.org/node/2025883
So to really use this module (other than just to read it, which should hopefully be instructive), you'll have to apply patches from those issues.
You can run the tests in this module without a Drupal installation.
It has a standard Composer structure, which you can set up in the standard Composer way. Here are the commands for those not familiar.
$ curl -sS https://getcomposer.org/installer | php
$ ./composer.phar install
$ ./vendor/bin/phpunit