class TestRunnerKernel

class TestRunnerKernel extends DrupalKernel {
    
    /**
     * {@inheritdoc}
     */
    public static function createFromRequest(Request $request, $class_loader, $environment = 'test_runner', $allow_dumping = TRUE, $app_root = NULL) {
        return parent::createFromRequest($request, $class_loader, $environment, $allow_dumping, $app_root);
    }
    
    /**
     * {@inheritdoc}
     */
    public function __construct($environment, $class_loader, $allow_dumping = FALSE, $app_root = NULL) {
        // Force $allow_dumping to FALSE, because the test runner kernel should
        // always have to rebuild its container, and potentially avoid isolation
        // issues against the tests.
        parent::__construct($environment, $class_loader, FALSE, $app_root);
        // Prime the module list and corresponding Extension objects.
        // @todo Remove System module. Needed because
        //   \Drupal\Core\Datetime\DateFormatter has a (needless) dependency on the
        //   'date_format' entity, so calls to DateFormatter::format() and
        //   DateFormatter::formatInterval() cause a plugin not found exception.
        $this->moduleList = [
            'system' => 0,
        ];
        $this->moduleData = [
            'system' => new Extension($this->root, 'module', 'core/modules/system/system.info.yml', 'system.module'),
        ];
        // In order to support Simpletest in Drupal 9 conditionally include the
        // module.
        $extensions = (new ExtensionDiscovery($this->root, FALSE, [], 'ignore_site_path_does_not_exist'))
            ->scan('module', FALSE);
        if (isset($extensions['simpletest'])) {
            $this->moduleList['simpletest'] = 0;
            $this->moduleData['simpletest'] = $extensions['simpletest'];
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function boot() {
        // Ensure that required Settings exist.
        if (!Settings::getAll()) {
            new Settings([
                'hash_salt' => 'run-tests',
                'container_yamls' => [],
                // If there is no settings.php, then there is no parent site. In turn,
                // there is no public files directory; use a custom public files path.
'file_public_path' => 'sites/default/files',
            ]);
        }
        // Remove Drupal's error/exception handlers; they are designed for HTML
        // and there is no storage nor a (watchdog) logger here.
        restore_error_handler();
        restore_exception_handler();
        // In addition, ensure that PHP errors are not hidden away in logs.
        ini_set('display_errors', TRUE);
        parent::boot();
        $this->getContainer()
            ->get('module_handler')
            ->loadAll();
        $test_discovery = new TestDiscovery($this->getContainer()
            ->getParameter('app.root'), $this->getContainer()
            ->get('class_loader'));
        $test_discovery->registerTestNamespaces();
        // Register stream wrappers.
        $this->getContainer()
            ->get('stream_wrapper_manager')
            ->register();
        // Create the build/artifacts directory if necessary.
        include_once $this->getAppRoot() . '/core/includes/file.inc';
        if (!is_dir('public://simpletest') && !@mkdir('public://simpletest', 0777, TRUE) && !is_dir('public://simpletest')) {
            throw new \RuntimeException('Unable to create directory: public://simpletest');
        }
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function discoverServiceProviders() {
        parent::discoverServiceProviders();
        // The test runner does not require an installed Drupal site to exist.
        // Therefore, its environment is identical to that of the early installer.
        $this->serviceProviderClasses['app']['Test'] = 'Drupal\\Core\\Installer\\InstallerServiceProvider';
        return $this->serviceProviderClasses;
    }

}