trait FunctionalTestSetupTrait

trait FunctionalTestSetupTrait {
    use SessionTestTrait;
    use RefreshVariablesTrait;
    
    /**
     * The "#1" admin user.
     *
     * @var \Drupal\Core\Session\AccountInterface
     */
    protected $rootUser;
    
    /**
     * The class loader to use for installation and initialization of setup.
     *
     * @var \Composer\Autoload\ClassLoader
     */
    protected $classLoader;
    
    /**
     * The flag to set 'apcu_ensure_unique_prefix' setting.
     *
     * Wide use of a unique prefix can lead to problems with memory, if tests are
     * run with a concurrency higher than 1. Therefore, FALSE by default.
     *
     * @var bool
     *
     * @see \Drupal\Core\Site\Settings::getApcuPrefix().
     */
    protected $apcuEnsureUniquePrefix = FALSE;
    
    /**
     * Prepares site settings and services before installation.
     */
    protected function prepareSettings() {
        // Prepare installer settings that are not install_drupal() parameters.
        // Copy and prepare an actual settings.php, so as to resemble a regular
        // installation.
        // Not using File API; a potential error must trigger a PHP warning.
        $directory = DRUPAL_ROOT . '/' . $this->siteDirectory;
        copy(DRUPAL_ROOT . '/sites/default/default.settings.php', $directory . '/settings.php');
        // The public file system path is created during installation. Additionally,
        // during tests:
        // - The temporary directory is set and created by install_base_system().
        // - The private file directory is created post install by
        //   FunctionalTestSetupTrait::initConfig().
        // @see system_requirements()
        // @see TestBase::prepareEnvironment()
        // @see install_base_system()
        // @see \Drupal\Core\Test\FunctionalTestSetupTrait::initConfig()
        $settings['settings']['file_public_path'] = (object) [
            'value' => $this->publicFilesDirectory,
            'required' => TRUE,
        ];
        $settings['settings']['file_private_path'] = (object) [
            'value' => $this->privateFilesDirectory,
            'required' => TRUE,
        ];
        $settings['settings']['file_temp_path'] = (object) [
            'value' => $this->tempFilesDirectory,
            'required' => TRUE,
        ];
        // Save the original site directory path, so that extensions in the
        // site-specific directory can still be discovered in the test site
        // environment.
        // @see \Drupal\Core\Extension\ExtensionDiscovery::scan()
        $settings['settings']['test_parent_site'] = (object) [
            'value' => $this->originalSite,
            'required' => TRUE,
        ];
        $settings['settings']['apcu_ensure_unique_prefix'] = (object) [
            'value' => $this->apcuEnsureUniquePrefix,
            'required' => TRUE,
        ];
        // Disable fetching of advisories during tests to avoid outbound calls. This
        // cannot be set in ::initConfig() because it would not stop these calls
        // during install. Tests that need to have the security advisories
        // functionality enabled should override this method and unset this
        // variable.
        // @see \Drupal\Tests\system\Functional\SecurityAdvisories\SecurityAdvisoryTest::writeSettings()
        $settings['config']['system.advisories']['enabled'] = (object) [
            'value' => FALSE,
            'required' => TRUE,
        ];
        $this->writeSettings($settings);
        // Allow for test-specific overrides.
        $settings_testing_file = DRUPAL_ROOT . '/' . $this->originalSite . '/settings.testing.php';
        if (file_exists($settings_testing_file)) {
            // Copy the testing-specific settings.php overrides in place.
            copy($settings_testing_file, $directory . '/settings.testing.php');
            // Add the name of the testing class to settings.php and include the
            // testing specific overrides.
            file_put_contents($directory . '/settings.php', "\n\$test_class = '" . static::class . "';\n" . 'include DRUPAL_ROOT . \'/\' . $site_path . \'/settings.testing.php\';' . "\n", FILE_APPEND);
        }
        $settings_services_file = DRUPAL_ROOT . '/' . $this->originalSite . '/testing.services.yml';
        if (!file_exists($settings_services_file)) {
            // Otherwise, use the default services as a starting point for overrides.
            $settings_services_file = DRUPAL_ROOT . '/sites/default/default.services.yml';
        }
        // Copy the testing-specific service overrides in place.
        copy($settings_services_file, $directory . '/services.yml');
        if ($this->strictConfigSchema) {
            // Add a listener to validate configuration schema on save.
            $yaml = new SymfonyYaml();
            $content = file_get_contents($directory . '/services.yml');
            $services = $yaml->parse($content);
            $services['services']['testing.config_schema_checker'] = [
                'class' => ConfigSchemaChecker::class,
                'arguments' => [
                    '@config.typed',
                    $this->getConfigSchemaExclusions(),
                ],
                'tags' => [
                    [
                        'name' => 'event_subscriber',
                    ],
                ],
            ];
            file_put_contents($directory . '/services.yml', $yaml->dump($services));
        }
        // Since Drupal is bootstrapped already, install_begin_request() will not
        // bootstrap again. Hence, we have to reload the newly written custom
        // settings.php manually.
        Settings::initialize(DRUPAL_ROOT, $this->siteDirectory, $this->classLoader);
    }
    
    /**
     * Rewrites the settings.php file of the test site.
     *
     * @param array $settings
     *   An array of settings to write out, in the format expected by
     *   drupal_rewrite_settings().
     *
     * @see drupal_rewrite_settings()
     */
    protected function writeSettings(array $settings) {
        include_once DRUPAL_ROOT . '/core/includes/install.inc';
        $filename = $this->siteDirectory . '/settings.php';
        // system_requirements() removes write permissions from settings.php
        // whenever it is invoked.
        // Not using File API; a potential error must trigger a PHP warning.
        chmod($filename, 0666);
        drupal_rewrite_settings($settings, $filename);
    }
    
    /**
     * Changes parameters in the services.yml file.
     *
     * @param string $name
     *   The name of the parameter.
     * @param string $value
     *   The value of the parameter.
     */
    protected function setContainerParameter($name, $value) {
        $filename = $this->siteDirectory . '/services.yml';
        chmod($filename, 0666);
        $services = Yaml::decode(file_get_contents($filename));
        $services['parameters'][$name] = $value;
        file_put_contents($filename, Yaml::encode($services));
        // Ensure that the cache is deleted for the yaml file loader.
        $file_cache = FileCacheFactory::get('container_yaml_loader');
        $file_cache->delete($filename);
    }
    
    /**
     * Rebuilds \Drupal::getContainer().
     *
     * Use this to update the test process's kernel with a new service container.
     * For example, when the list of enabled modules is changed via the internal
     * browser the test process's kernel has a service container with an out of
     * date module list.
     *
     * @see TestBase::prepareEnvironment()
     * @see TestBase::restoreEnvironment()
     *
     * @todo Fix https://www.drupal.org/node/2941757 so that module enable/disable
     *   changes are immediately reflected in \Drupal::getContainer(). Until then,
     *   tests can invoke this workaround when requiring services from newly
     *   enabled modules to be immediately available in the same request.
     */
    protected function rebuildContainer() {
        // Rebuild the kernel and bring it back to a fully bootstrapped state.
        $this->container = $this->kernel
            ->rebuildContainer();
        // Make sure the URL generator has a request object, otherwise calls to
        // $this->drupalGet() will fail.
        $this->prepareRequestForGenerator();
    }
    
    /**
     * Resets all data structures after having enabled new modules.
     *
     * This method is called by FunctionalTestSetupTrait::rebuildAll() after
     * enabling the requested modules. It must be called again when additional
     * modules are enabled later.
     *
     * @see \Drupal\Core\Test\FunctionalTestSetupTrait::rebuildAll()
     * @see \Drupal\Tests\BrowserTestBase::installDrupal()
     */
    protected function resetAll() {
        // Clear all database and static caches and rebuild data structures.
        drupal_flush_all_caches();
        $this->container = \Drupal::getContainer();
        // Reset static variables and reload permissions.
        $this->refreshVariables();
    }
    
    /**
     * Creates a mock request and sets it on the generator.
     *
     * This is used to manipulate how the generator generates paths during tests.
     * It also ensures that calls to $this->drupalGet() will work when running
     * from run-tests.sh because the URL generator no longer looks at the global
     * variables that are set there but relies on getting this information from a
     * request object.
     *
     * @param bool $clean_urls
     *   Whether to mock the request using clean URLs.
     * @param array $override_server_vars
     *   An array of server variables to override.
     *
     * @return \Symfony\Component\HttpFoundation\Request
     *   The mocked request object.
     */
    protected function prepareRequestForGenerator($clean_urls = TRUE, $override_server_vars = []) {
        $request = Request::createFromGlobals();
        $server = $request->server
            ->all();
        if (basename($server['SCRIPT_FILENAME']) != basename($server['SCRIPT_NAME'])) {
            // We need this for when the test is executed by run-tests.sh.
            // @todo Remove this once run-tests.sh has been converted to use a Request
            //   object.
            $cwd = getcwd();
            $server['SCRIPT_FILENAME'] = $cwd . '/' . basename($server['SCRIPT_NAME']);
            $base_path = rtrim($server['REQUEST_URI'], '/');
        }
        else {
            $base_path = $request->getBasePath();
        }
        if ($clean_urls) {
            $request_path = $base_path ? $base_path . '/user' : 'user';
        }
        else {
            $request_path = $base_path ? $base_path . '/index.php/user' : '/index.php/user';
        }
        $server = array_merge($server, $override_server_vars);
        $request = Request::create($request_path, 'GET', [], [], [], $server);
        // Ensure the request time is REQUEST_TIME to ensure that API calls
        // in the test use the right timestamp.
        $request->server
            ->set('REQUEST_TIME', REQUEST_TIME);
        $this->container
            ->get('request_stack')
            ->push($request);
        // The request context is normally set by the router_listener from within
        // its KernelEvents::REQUEST listener. In the simpletest parent site this
        // event is not fired, therefore it is necessary to updated the request
        // context manually here.
        $this->container
            ->get('router.request_context')
            ->fromRequest($request);
        return $request;
    }
    
    /**
     * Execute the non-interactive installer.
     *
     * @see install_drupal()
     */
    protected function doInstall() {
        require_once DRUPAL_ROOT . '/core/includes/install.core.inc';
        $parameters = $this->installParameters();
        // Simulate a real install which does not start with the any connections set
        // in \Drupal\Core\Database\Database::$connections.
        Database::removeConnection('default');
        install_drupal($this->classLoader, $parameters);
    }
    
    /**
     * Initialize settings created during install.
     */
    protected function initSettings() {
        Settings::initialize(DRUPAL_ROOT, $this->siteDirectory, $this->classLoader);
        // After writing settings.php, the installer removes write permissions
        // from the site directory. To allow drupal_generate_test_ua() to write
        // a file containing the private key for drupal_valid_test_ua(), the site
        // directory has to be writable.
        // TestBase::restoreEnvironment() will delete the entire site directory.
        // Not using File API; a potential error must trigger a PHP warning.
        chmod(DRUPAL_ROOT . '/' . $this->siteDirectory, 0777);
        // During tests, cacheable responses should get the debugging cacheability
        // headers by default.
        $this->setContainerParameter('http.response.debug_cacheability_headers', TRUE);
    }
    
    /**
     * Initialize various configurations post-installation.
     *
     * @param \Symfony\Component\DependencyInjection\ContainerInterface $container
     *   The container.
     */
    protected function initConfig(ContainerInterface $container) {
        $config = $container->get('config.factory');
        // Manually create the private directory.
        \Drupal::service('file_system')->prepareDirectory($this->privateFilesDirectory, FileSystemInterface::CREATE_DIRECTORY);
        // Manually configure the test mail collector implementation to prevent
        // tests from sending out emails and collect them in state instead.
        // While this should be enforced via settings.php prior to installation,
        // some tests expect to be able to test mail system implementations.
        $config->getEditable('system.mail')
            ->set('interface.default', 'test_mail_collector')
            ->save();
        // By default, verbosely display all errors and disable all production
        // environment optimizations for all tests to avoid needless overhead and
        // ensure a sane default experience for test authors.
        // @see https://www.drupal.org/node/2259167
        $config->getEditable('system.logging')
            ->set('error_level', 'verbose')
            ->save();
        $config->getEditable('system.performance')
            ->set('css.preprocess', FALSE)
            ->set('js.preprocess', FALSE)
            ->save();
        // Set an explicit time zone to not rely on the system one, which may vary
        // from setup to setup. The Australia/Sydney time zone is chosen so all
        // tests are run using an edge case scenario (UTC10 and DST). This choice
        // is made to prevent time zone related regressions and reduce the
        // fragility of the testing system in general.
        $config->getEditable('system.date')
            ->set('timezone.default', 'Australia/Sydney')
            ->save();
    }
    
    /**
     * Initializes user 1 for the site to be installed.
     */
    protected function initUserSession() {
        $password = $this->randomMachineName();
        // Define information about the user 1 account.
        $this->rootUser = new UserSession([
            'uid' => 1,
            'name' => 'admin',
            'mail' => 'admin@example.com',
            'pass_raw' => $password,
            'passRaw' => $password,
            'timezone' => date_default_timezone_get(),
        ]);
        // The child site derives its session name from the database prefix when
        // running web tests.
        $this->generateSessionName($this->databasePrefix);
    }
    
    /**
     * Initializes the kernel after installation.
     *
     * @param \Symfony\Component\HttpFoundation\Request $request
     *   Request object.
     *
     * @return \Symfony\Component\DependencyInjection\ContainerInterface
     *   The container.
     */
    protected function initKernel(Request $request) {
        $this->kernel = DrupalKernel::createFromRequest($request, $this->classLoader, 'prod', TRUE);
        $this->kernel
            ->boot();
        // Add our request to the stack and route context.
        $request->attributes
            ->set(RouteObjectInterface::ROUTE_OBJECT, new Route('<none>'));
        $request->attributes
            ->set(RouteObjectInterface::ROUTE_NAME, '<none>');
        $this->kernel
            ->preHandle($request);
        return $this->kernel
            ->getContainer();
    }
    
    /**
     * Installs the default theme defined by `static::$defaultTheme` when needed.
     *
     * To install a test theme outside of the testing environment, add
     * @code
     * $settings['extension_discovery_scan_tests'] = TRUE;
     * @endcode
     * to your settings.php.
     *
     * @param \Symfony\Component\DependencyInjection\ContainerInterface $container
     *   The container.
     *
     * @throws \Exception
     *   If the test case does not initialize default theme.
     */
    protected function installDefaultThemeFromClassProperty(ContainerInterface $container) {
        // Use the install profile to determine the default theme if configured and
        // not already specified.
        $profile = $container->getParameter('install_profile');
        $default_sync_path = $container->get('extension.list.profile')
            ->getPath($profile) . '/config/sync';
        $profile_config_storage = new FileStorage($default_sync_path, StorageInterface::DEFAULT_COLLECTION);
        if (!isset($this->defaultTheme) && $profile_config_storage->exists('system.theme')) {
            $this->defaultTheme = $profile_config_storage->read('system.theme')['default'];
        }
        $default_install_path = $container->get('extension.list.profile')
            ->getPath($profile) . '/' . InstallStorage::CONFIG_INSTALL_DIRECTORY;
        $profile_config_storage = new FileStorage($default_install_path, StorageInterface::DEFAULT_COLLECTION);
        if (!isset($this->defaultTheme) && $profile_config_storage->exists('system.theme')) {
            $this->defaultTheme = $profile_config_storage->read('system.theme')['default'];
        }
        // Require a default theme to be specified at this point.
        if (!isset($this->defaultTheme)) {
            throw new \Exception('Drupal\\Tests\\BrowserTestBase::$defaultTheme is required. See https://www.drupal.org/node/3083055, which includes recommendations on which theme to use.');
        }
        // Ensure the default theme is installed.
        $container->get('theme_installer')
            ->install([
            $this->defaultTheme,
        ], TRUE);
        $system_theme_config = $container->get('config.factory')
            ->getEditable('system.theme');
        if ($system_theme_config->get('default') !== $this->defaultTheme) {
            $system_theme_config->set('default', $this->defaultTheme)
                ->save();
        }
    }
    
    /**
     * Install modules defined by `static::$modules`.
     *
     * To install test modules outside of the testing environment, add
     * @code
     * $settings['extension_discovery_scan_tests'] = TRUE;
     * @endcode
     * to your settings.php.
     *
     * @param \Symfony\Component\DependencyInjection\ContainerInterface $container
     *   The container.
     */
    protected function installModulesFromClassProperty(ContainerInterface $container) {
        $class = static::class;
        $modules = [];
        while ($class) {
            if (property_exists($class, 'modules')) {
                $modules = array_merge($modules, $class::$modules);
            }
            $class = get_parent_class($class);
        }
        if ($modules) {
            $modules = array_unique($modules);
            try {
                $success = $container->get('module_installer')
                    ->install($modules, TRUE);
                $this->assertTrue($success, new FormattableMarkup('Enabled modules: %modules', [
                    '%modules' => implode(', ', $modules),
                ]));
            } catch (MissingDependencyException $e) {
                // The exception message has all the details.
                $this->fail($e->getMessage());
            }
            // The container was already rebuilt by the ModuleInstaller.
            $this->container = \Drupal::getContainer();
        }
    }
    
    /**
     * Resets and rebuilds the environment after setup.
     */
    protected function rebuildAll() {
        // Reset/rebuild all data structures after enabling the modules, primarily
        // to synchronize all data structures and caches between the test runner and
        // the child site.
        // @see \Drupal\Core\DrupalKernel::bootCode()
        // @todo Test-specific setUp() methods may set up further fixtures; find a
        //   way to execute this after setUp() is done, or to eliminate it entirely.
        $this->resetAll();
        // Explicitly call register() again on the container registered in \Drupal.
        // @todo This should already be called through
        //   DrupalKernel::prepareLegacyRequest() -> DrupalKernel::boot() but that
        //   appears to be calling a different container.
        $this->container
            ->get('stream_wrapper_manager')
            ->register();
    }
    
    /**
     * Returns the parameters that will be used when Simpletest installs Drupal.
     *
     * @see install_drupal()
     * @see install_state_defaults()
     *
     * @return array
     *   Array of parameters for use in install_drupal().
     */
    protected function installParameters() {
        $connection_info = Database::getConnectionInfo();
        $driver = $connection_info['default']['driver'];
        unset($connection_info['default']['driver']);
        unset($connection_info['default']['namespace']);
        unset($connection_info['default']['autoload']);
        unset($connection_info['default']['pdo']);
        unset($connection_info['default']['init_commands']);
        // Remove database connection info that is not used by SQLite.
        if ($driver === 'sqlite') {
            unset($connection_info['default']['username']);
            unset($connection_info['default']['password']);
            unset($connection_info['default']['host']);
            unset($connection_info['default']['port']);
        }
        $parameters = [
            'interactive' => FALSE,
            'parameters' => [
                'profile' => $this->profile,
                'langcode' => 'en',
            ],
            'forms' => [
                'install_settings_form' => [
                    'driver' => $driver,
                    $driver => $connection_info['default'],
                ],
                'install_configure_form' => [
                    'site_name' => 'Drupal',
                    'site_mail' => 'simpletest@example.com',
                    'account' => [
                        'name' => $this->rootUser->name,
                        'mail' => $this->rootUser
                            ->getEmail(),
                        'pass' => [
                            'pass1' => $this->rootUser->pass_raw ?? $this->rootUser->passRaw,
                            'pass2' => $this->rootUser->pass_raw ?? $this->rootUser->passRaw,
                        ],
                    ],
                    // \Drupal\Core\Render\Element\Checkboxes::valueCallback() requires
                    // NULL instead of FALSE values for programmatic form submissions to
                    // disable a checkbox.
'enable_update_status_module' => NULL,
                    'enable_update_status_emails' => NULL,
                ],
            ],
        ];
        // If we only have one db driver available, we cannot set the driver.
        include_once DRUPAL_ROOT . '/core/includes/install.inc';
        if (count($this->getDatabaseTypes()) == 1) {
            unset($parameters['forms']['install_settings_form']['driver']);
        }
        return $parameters;
    }
    
    /**
     * Sets up the base URL based upon the environment variable.
     *
     * @throws \Exception
     *   Thrown when no SIMPLETEST_BASE_URL environment variable is provided or uses an invalid scheme.
     */
    protected function setupBaseUrl() {
        global $base_url;
        // Get and set the domain of the environment we are running our test
        // coverage against.
        $base_url = getenv('SIMPLETEST_BASE_URL');
        if (!$base_url) {
            throw new \Exception('You must provide a SIMPLETEST_BASE_URL environment variable to run some PHPUnit based functional tests.');
        }
        // Setup $_SERVER variable.
        $parsed_url = parse_url($base_url);
        $host = $parsed_url['host'] . (isset($parsed_url['port']) ? ':' . $parsed_url['port'] : '');
        $path = isset($parsed_url['path']) ? rtrim(rtrim($parsed_url['path']), '/') : '';
        $port = $parsed_url['port'] ?? 80;
        $valid_url_schemes = [
            'http',
            'https',
        ];
        if (!in_array(strtolower($parsed_url['scheme']), $valid_url_schemes, TRUE)) {
            throw new \Exception('You must provide valid scheme for the SIMPLETEST_BASE_URL environment variable. Valid schema are: http, https.');
        }
        $this->baseUrl = $base_url;
        // If the passed URL schema is 'https' then setup the $_SERVER variables
        // properly so that testing will run under HTTPS.
        if ($parsed_url['scheme'] === 'https') {
            $_SERVER['HTTPS'] = 'on';
        }
        $_SERVER['HTTP_HOST'] = $host;
        $_SERVER['REMOTE_ADDR'] = '127.0.0.1';
        $_SERVER['SERVER_ADDR'] = '127.0.0.1';
        $_SERVER['SERVER_PORT'] = $port;
        $_SERVER['SERVER_SOFTWARE'] = NULL;
        $_SERVER['SERVER_NAME'] = 'localhost';
        $_SERVER['REQUEST_URI'] = $path . '/';
        $_SERVER['REQUEST_METHOD'] = 'GET';
        $_SERVER['SCRIPT_NAME'] = $path . '/index.php';
        $_SERVER['SCRIPT_FILENAME'] = $path . '/index.php';
        $_SERVER['PHP_SELF'] = $path . '/index.php';
        $_SERVER['HTTP_USER_AGENT'] = 'Drupal command line';
    }
    
    /**
     * Prepares the current environment for running the test.
     *
     * Also sets up new resources for the testing environment, such as the public
     * filesystem and configuration directories.
     */
    protected function prepareEnvironment() {
        // Bootstrap Drupal so we can use Drupal's built in functions.
        $this->classLoader = (require __DIR__ . '/../../../../../autoload.php');
        $request = Request::createFromGlobals();
        $kernel = TestRunnerKernel::createFromRequest($request, $this->classLoader);
        // TestRunnerKernel expects the working directory to be DRUPAL_ROOT.
        chdir(DRUPAL_ROOT);
        $kernel->boot();
        $kernel->preHandle($request);
        $this->prepareDatabasePrefix();
        $this->originalSite = $kernel->findSitePath($request);
        // Create test directory ahead of installation so fatal errors and debug
        // information can be logged during installation process.
        \Drupal::service('file_system')->prepareDirectory($this->siteDirectory, FileSystemInterface::CREATE_DIRECTORY | FileSystemInterface::MODIFY_PERMISSIONS);
        // Prepare filesystem directory paths.
        $this->publicFilesDirectory = $this->siteDirectory . '/files';
        $this->privateFilesDirectory = $this->siteDirectory . '/private';
        $this->tempFilesDirectory = $this->siteDirectory . '/temp';
        $this->translationFilesDirectory = $this->siteDirectory . '/translations';
        // Ensure the configImporter is refreshed for each test.
        $this->configImporter = NULL;
        // Unregister all custom stream wrappers of the parent site.
        $wrappers = \Drupal::service('stream_wrapper_manager')->getWrappers(StreamWrapperInterface::ALL);
        foreach ($wrappers as $scheme => $info) {
            stream_wrapper_unregister($scheme);
        }
        // Reset statics.
        drupal_static_reset();
        $this->container = NULL;
        // Unset globals.
        unset($GLOBALS['config']);
        unset($GLOBALS['conf']);
        // Log fatal errors.
        ini_set('log_errors', 1);
        ini_set('error_log', DRUPAL_ROOT . '/' . $this->siteDirectory . '/error.log');
        // Change the database prefix.
        $this->changeDatabasePrefix();
        // After preparing the environment and changing the database prefix, we are
        // in a valid test environment.
        drupal_valid_test_ua($this->databasePrefix);
        // Reset settings.
        new Settings([
            // For performance, simply use the database prefix as hash salt.
'hash_salt' => $this->databasePrefix,
        ]);
        Environment::setTimeLimit($this->timeLimit);
        // Save and clean the shutdown callbacks array because it is static cached
        // and will be changed by the test run. Otherwise it will contain callbacks
        // from both environments and the testing environment will try to call the
        // handlers defined by the original one.
        $callbacks =& drupal_register_shutdown_function();
        $this->originalShutdownCallbacks = $callbacks;
        $callbacks = [];
    }
    
    /**
     * Returns all supported database driver installer objects.
     *
     * This wraps drupal_get_database_types() for use without a current container.
     *
     * @return \Drupal\Core\Database\Install\Tasks[]
     *   An array of available database driver installer objects.
     */
    protected function getDatabaseTypes() {
        if (isset($this->originalContainer) && $this->originalContainer) {
            \Drupal::setContainer($this->originalContainer);
        }
        $database_types = drupal_get_database_types();
        if (isset($this->originalContainer) && $this->originalContainer) {
            \Drupal::unsetContainer();
        }
        return $database_types;
    }

}