PHP unit and integration tests for Wikia app are automatically executed for each pull request by the Travis CI continuous integration system. If you'd like to run them locally, the following steps should help you get started on macOS:

1. Make sure you have PHP 7.0 installed. On macOS, this is easiest to do via Homebrew:

   $ brew install php@7.0 && brew link php@7.0 --force
   

2. Install at least the uopz and xdebug extensions from PECL.:

   $ pecl install uopz xdebug
   

3. Set up a local MySQL 5.7 server. This is again easiest to do via Homebrew:

   $ brew install mysql@5.7 && brew link mysql@5.7 --force && mysql.server start && mysql_secure_installation
   

   mysql_secure_installation will prompt you several questions, the only thing we care about is setting the root password. Since the database will be exclusive to localhost (your laptop) and only used for tests, any sensible value is good here.
4. Make sure that the parent directory of your app clone does NOT contain a config subdirectory with anything of value. The tests will write to this directory and destroy everything there!

On certain Linux distributions, you might need to install PHP's mysqli extension independently of PHP itself. Here is how to do that for Debian and derivatives:

# apt-get install php-mysql

You may also need to set up MySQL account permissions:

GRANT ALL ON firefly.* TO 'your_username'@'localhost';
GRANT SUPER ON *.* TO 'your_username'@'localhost';

Once you got your environment setup, you can run the tests. Set the MYSQL_USER and MYSQL_PASSWORD to the credentials you configured during installation (on macOS, you can use the provided root user):

$ MYSQL_USER=root MYSQL_PASSWORD=my_pw ./php-tests.sh

In order to run only a subset of all tests, pass a directory or file to the test runner as an argument:

$ MYSQL_USER=root MYSQL_PASSWORD=my_pw ./php-tests.sh ../extensions/wikia/Example # run tests for Example only
$ MYSQL_USER=root MYSQL_PASSWORD=my_pw ./php-tests.sh ../extensions/wikia/Example/tests/MyTest.php # run only MyTest

If you simply want to run subset of unit tests that do not depend on db, you can use the run-test.php script directly:

x@dev-x:/usr/wikia/source/app/tests$ SERVER_DBNAME=firefly php run-test.php ../extensions/wikia/CreateNewWiki/tests/

If you add a test which relies on PHP extensions to function (e.g. a test that involves rendering mustache templates), check if the extension is loaded in the test setup phase.

use PHPUnit\Framework\TestCase;

class MyTest extends TestCase {
	protected function setUp() {
		parent::setUp();

		if ( !extension_loaded( 'mustache' ) ) {
			$this->markTestSkipped( '"mustache" PHP extension needs to be loaded!' );
		}
	}
}

This way, the test will be gracefully skipped if the required extension is not available locally.

First fetch the dependencies from NPM:

$ npm install

Then you can run the tests with:

$ ./js-all