SpecialJavaScriptTest.php

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<?php
namespace MediaWiki\Specials;
 
use MediaWiki\Config\HashConfig;
use MediaWiki\Config\MultiConfig;
use MediaWiki\Exception\HttpError;
use MediaWiki\Html\Html;
use MediaWiki\MainConfigNames;
use MediaWiki\Request\FauxRequest;
use MediaWiki\ResourceLoader as RL;
use MediaWiki\ResourceLoader\ResourceLoader;
use MediaWiki\SpecialPage\SpecialPage;
 
class SpecialJavaScriptTest extends SpecialPage {
 
    public function __construct() {
        parent::__construct( 'JavaScriptTest' );
    }
 
    public function execute( $par ) {
        $this->getOutput()->disable();
 
        if ( $par === 'qunit/export' ) {
            // Send the JavaScript payload.
            $this->exportJS();
        } elseif ( $par === null || $par === '' || $par === 'qunit' || $par === 'qunit/plain' ) {
            // Render the page
            // (Support "/qunit" and "/qunit/plain" for backwards-compatibility)
            $this->renderPage();
        } else {
            wfHttpError( 404, 'Unknown action', "Unknown action \"$par\"." );
        }
    }
 
    private function getComponents(): array {
        $components = [];
 
        $rl = $this->getOutput()->getResourceLoader();
        foreach ( $rl->getTestSuiteModuleNames() as $module ) {
            if ( str_starts_with( $module, 'test.' ) ) {
                $components[] = substr( $module, 5 );
            }
        }
 
        return $components;
    }
 
    private function getModulesForComponentOrThrow( ?string $component ): array {
        if ( $component !== null ) {
            if ( !in_array( $component, $this->getComponents() ) ) {
                throw new HttpError(
                    404,
                    "No test module found for the '$component' component.\n"
                        . "Make sure the extension is enabled via wfLoadExtension(),\n"
                        . "and register a test module via the QUnitTestModule attribute in extension.json.",
                    'Unknown component',
                );
            }
            return [ 'test.' . $component ];
        } else {
            $rl = $this->getOutput()->getResourceLoader();
            return $rl->getTestSuiteModuleNames();
        }
    }
 
    private function exportJS() {
        $out = $this->getOutput();
        $req = $this->getContext()->getRequest();
        $rl = $out->getResourceLoader();
 
        // Allow framing (disabling wgBreakFrames). Otherwise, mediawiki.page.ready
        // will close this tab when running from CLI using karma-qunit.
        $out->getMetadata()->setPreventClickjacking( false );
 
        $query = [
            'lang' => 'qqx',
            'skin' => 'fallback',
            'debug' => $req->getRawVal( 'debug' ),
            'target' => 'test',
        ];
        $embedContext = new RL\Context( $rl, new FauxRequest( $query ) );
        $query['only'] = 'scripts';
        $startupContext = new RL\Context( $rl, new FauxRequest( $query ) );
 
        $component = $req->getRawVal( 'component' );
        $modules = $this->getModulesForComponentOrThrow( $component );
 
        // Disable module storage.
        // The unit test for mw.loader.store will enable it (with a mock timers).
        $config = new MultiConfig( [
            new HashConfig( [ MainConfigNames::ResourceLoaderStorageEnabled => false ] ),
            $rl->getConfig(),
        ] );
 
        // The below is essentially a pure-javascript version of OutputPage::headElement().
        $startupModule = $rl->getModule( 'startup' );
        $startupModule->setConfig( $config );
        $code = $rl->makeModuleResponse( $startupContext, [ 'startup' => $startupModule ] );
        // The following has to be deferred via RLQ because the startup module is asynchronous.
        $code .= ResourceLoader::makeLoaderConditionalScript(
            // Embed page-specific mw.config variables (substitute for OutputPage::getJSVars)
            //
            // For compatibility with older tests, these will come from the user
            // action "viewing Special:JavaScripTest".
            //
            // This is deprecated since MediaWiki 1.25 and slowly being phased out in favour of:
            // 1. tests explicitly mocking the configuration they depend on.
            // 2. tests explicitly skipping or not loading code that is only meant
            //    for real page views (e.g. not loading as dependency, or using a QUnit
            //    conditional).
            //
            // See https://phabricator.wikimedia.org/T89434.
            // Keep a select few that are commonly referenced.
            'mw.config.set(' . $embedContext->encodeJson( [
                // used by mediawiki.util
                'wgPageName' => 'Special:Badtitle/JavaScriptTest',
                // used as input for mw.Title
                'wgRelevantPageName' => 'Special:Badtitle/JavaScriptTest',
                // used by testrunner.js for QUnit toolbar
                'wgTestModuleComponents' => $this->getComponents(),
            ] ) . ');'
            // Embed site-wide mw.config variables (override ResourceLoader::getSiteConfigSettings)
            //
            // To ensure stable testing irrespective of the developer's LocalSettings.php file,
            // inspired by T277470.
            . 'mw.config.set(' . $embedContext->encodeJson( [
                // used by mediawiki.Title
                'wgCaseSensitiveNamespaces' => [],
            ] ) . ');'
            // Embed private modules as they're not allowed to be loaded dynamically
            . $rl->makeModuleResponse( $embedContext, [
                'user.options' => $rl->getModule( 'user.options' ),
            ] )
            // Load all the test modules
            . Html::encodeJsCall( 'mw.loader.load', [ $modules ] )
        );
        $encModules = Html::encodeJsVar( $modules );
        $code .= ResourceLoader::makeInlineCodeWithModule( 'mediawiki.base', <<<JAVASCRIPT
    // Wait for each module individually, so that partial failures wont break the page
    // completely by rejecting the promise before all/ any modules are loaded.
    var promises = $encModules.map( function( module ) {
        return mw.loader.using( module ).promise();
    } );
    Promise.allSettled( promises ).then( QUnit.start );
JAVASCRIPT
        );
 
        header( 'Content-Type: text/javascript; charset=utf-8' );
        header( 'Cache-Control: private, no-cache, must-revalidate' );
        echo $code;
    }
 
    private function renderPage() {
        $req = $this->getContext()->getRequest();
        $component = $req->getRawVal( 'component' );
        // If set, validate
        $this->getModulesForComponentOrThrow( $component );
 
        $basePath = $this->getConfig()->get( MainConfigNames::ResourceBasePath );
        $headHtml = implode( "\n", [
            Html::linkedStyle( "$basePath/resources/lib/qunitjs/qunit.css" ),
            Html::linkedStyle( "$basePath/resources/src/qunitjs/qunit-local.css" ),
        ] );
 
        $scriptUrl = $this->getPageTitle( 'qunit/export' )->getFullURL( [
            'debug' => $req->getRawVal( 'debug' ) ?? '0',
            'component' => $component,
        ] );
        $script = implode( "\n", [
            Html::linkedScript( "$basePath/resources/lib/qunitjs/qunit.js" ),
            Html::inlineScript( 'QUnit.config.autostart = false;' ),
            Html::linkedScript( $scriptUrl ),
        ] );
 
        header( 'Content-Type: text/html; charset=utf-8' );
        echo <<<HTML
<!DOCTYPE html>
<title>QUnit</title>
$headHtml
<div id="qunit"></div>
<div id="qunit-fixture"></div>
$script
HTML;
    }
 
    protected function getGroupName() {
        return 'other';
    }
}
 
// @codeCoverageIgnoreStart
class_alias( SpecialJavaScriptTest::class, 'SpecialJavaScriptTest' );
// @codeCoverageIgnoreEnd