ExtensionsTestSuite.php

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<?php
class ExtensionsTestSuite extends PHPUnit_Framework_TestSuite {
    public function __construct() {
        parent::__construct();
 
        $paths = [];
        // Autodiscover extension unit tests
        $registry = ExtensionRegistry::getInstance();
        foreach ( $registry->getAllThings() as $info ) {
            $paths[] = dirname( $info['path'] ) . '/tests/phpunit';
        }
        // Extensions can return a list of files or directories
        Hooks::run( 'UnitTestsList', [ &$paths ] );
        foreach ( array_unique( $paths ) as $path ) {
            if ( is_dir( $path ) ) {
                // If the path is a directory, search for test cases.
                // @since 1.24
                $suffixes = [ 'Test.php' ];
                $fileIterator = new File_Iterator_Facade();
                $matchingFiles = $fileIterator->getFilesAsArray( $path, $suffixes );
                $this->addTestFiles( $matchingFiles );
            } elseif ( file_exists( $path ) ) {
                // Add a single test case or suite class
                $this->addTestFile( $path );
            }
        }
        if ( !$paths ) {
            $this->addTest( new DummyExtensionsTest( 'testNothing' ) );
        }
    }
 
    public static function suite() {
        return new self;
    }
}
 
class DummyExtensionsTest extends MediaWikiTestCase {
    public function testNothing() {
        $this->assertTrue( true );
    }
}