class UpdatePathTestBase

abstract class UpdatePathTestBase extends WebTestBase {
    use SchemaCheckTestTrait;
    
    /**
     * Modules to enable after the database is loaded.
     */
    protected static $modules = [];
    
    /**
     * The file path(s) to the dumped database(s) to load into the child site.
     *
     * The file system/tests/fixtures/update/drupal-8.bare.standard.php.gz is
     * normally included first -- this sets up the base database from a bare
     * standard Drupal installation.
     *
     * The file system/tests/fixtures/update/drupal-8.filled.standard.php.gz
     * can also be used in case we want to test with a database filled with
     * content, and with all core modules enabled.
     *
     * @var array
     */
    protected $databaseDumpFiles = [];
    
    /**
     * The install profile used in the database dump file.
     *
     * @var string
     */
    protected $installProfile = 'standard';
    
    /**
     * Flag that indicates whether the child site has been updated.
     *
     * @var bool
     */
    protected $upgradedSite = FALSE;
    
    /**
     * Array of errors triggered during the update process.
     *
     * @var array
     */
    protected $upgradeErrors = [];
    
    /**
     * Array of modules loaded when the test starts.
     *
     * @var array
     */
    protected $loadedModules = [];
    
    /**
     * Flag to indicate whether zlib is installed or not.
     *
     * @var bool
     */
    protected $zlibInstalled = TRUE;
    
    /**
     * Flag to indicate whether there are pending updates or not.
     *
     * @var bool
     */
    protected $pendingUpdates = TRUE;
    
    /**
     * The update URL.
     *
     * @var string
     */
    protected $updateUrl;
    
    /**
     * Disable strict config schema checking.
     *
     * The schema is verified at the end of running the update.
     *
     * @var bool
     */
    protected $strictConfigSchema = FALSE;
    
    /**
     * Fail the test if there are failed updates.
     *
     * @var bool
     */
    protected $checkFailedUpdates = TRUE;
    
    /**
     * Constructs an UpdatePathTestCase object.
     *
     * @param $test_id
     *   (optional) The ID of the test. Tests with the same id are reported
     *   together.
     */
    public function __construct($test_id = NULL) {
        parent::__construct($test_id);
        $this->zlibInstalled = function_exists('gzopen');
    }
    
    /**
     * Overrides WebTestBase::setUp() for update testing.
     *
     * The main difference in this method is that rather than performing the
     * installation via the installer, a database is loaded. Additional work is
     * then needed to set various things such as the config directories and the
     * container that would normally be done via the installer.
     */
    protected function setUp() {
        $this->runDbTasks();
        // Allow classes to set database dump files.
        $this->setDatabaseDumpFiles();
        // We are going to set a missing zlib requirement property for usage
        // during the performUpgrade() and tearDown() methods. Also set that the
        // tests failed.
        if (!$this->zlibInstalled) {
            parent::setUp();
            return;
        }
        // Set the update url. This must be set here rather than in
        // self::__construct() or the old URL generator will leak additional test
        // sites.
        $this->updateUrl = Url::fromRoute('system.db_update');
        // These methods are called from parent::setUp().
        $this->setBatch();
        $this->initUserSession();
        $this->prepareSettings();
        // Load the database(s).
        foreach ($this->databaseDumpFiles as $file) {
            if (substr($file, -3) == '.gz') {
                $file = "compress.zlib://{$file}";
            }
            require $file;
        }
        $this->initSettings();
        $request = Request::createFromGlobals();
        $container = $this->initKernel($request);
        $this->initConfig($container);
        // Restore the original Simpletest batch.
        $this->restoreBatch();
        // Set the container. parent::rebuildAll() would normally do this, but this
        // not safe to do here, because the database has not been updated yet.
        $this->container = \Drupal::getContainer();
        $this->replaceUser1();
        require_once \Drupal::root() . '/core/includes/update.inc';
    }
    
    /**
     * Set database dump files to be used.
     */
    protected abstract function setDatabaseDumpFiles();
    
    /**
     * Add settings that are missed since the installer isn't run.
     */
    protected function prepareSettings() {
        parent::prepareSettings();
        // Remember the profile which was used.
        $settings['settings']['install_profile'] = (object) [
            'value' => $this->installProfile,
            'required' => TRUE,
        ];
        // Generate a hash salt.
        $settings['settings']['hash_salt'] = (object) [
            'value' => Crypt::randomBytesBase64(55),
            'required' => TRUE,
        ];
        // Since the installer isn't run, add the database settings here too.
        $settings['databases']['default'] = (object) [
            'value' => Database::getConnectionInfo(),
            'required' => TRUE,
        ];
        $this->writeSettings($settings);
    }
    
    /**
     * Helper function to run pending database updates.
     */
    protected function runUpdates() {
        if (!$this->zlibInstalled) {
            $this->fail('Missing zlib requirement for update tests.');
            return FALSE;
        }
        // The site might be broken at the time so logging in using the UI might
        // not work, so we use the API itself.
        drupal_rewrite_settings([
            'settings' => [
                'update_free_access' => (object) [
                    'value' => TRUE,
                    'required' => TRUE,
                ],
            ],
        ]);
        $this->drupalGet($this->updateUrl);
        $this->clickLink(t('Continue'));
        $this->doSelectionTest();
        // Run the update hooks.
        $this->clickLink(t('Apply pending updates'));
        // Ensure there are no failed updates.
        if ($this->checkFailedUpdates) {
            $this->assertNoRaw('<strong>' . t('Failed:') . '</strong>');
            // Ensure that there are no pending updates.
            foreach ([
                'update',
                'post_update',
            ] as $update_type) {
                switch ($update_type) {
                    case 'update':
                        $all_updates = update_get_update_list();
                        break;
                    case 'post_update':
                        $all_updates = \Drupal::service('update.post_update_registry')->getPendingUpdateInformation();
                        break;
                }
                foreach ($all_updates as $module => $updates) {
                    if (!empty($updates['pending'])) {
                        foreach (array_keys($updates['pending']) as $update_name) {
                            $this->fail("The {$update_name}() update function from the {$module} module did not run.");
                        }
                    }
                }
            }
            // Reset the static cache of drupal_get_installed_schema_version() so that
            // more complex update path testing works.
            drupal_static_reset('drupal_get_installed_schema_version');
            // The config schema can be incorrect while the update functions are being
            // executed. But once the update has been completed, it needs to be valid
            // again. Assert the schema of all configuration objects now.
            $names = $this->container
                ->get('config.storage')
                ->listAll();
            
            /** @var \Drupal\Core\Config\TypedConfigManagerInterface $typed_config */
            $typed_config = $this->container
                ->get('config.typed');
            $typed_config->clearCachedDefinitions();
            foreach ($names as $name) {
                $config = $this->config($name);
                $this->assertConfigSchema($typed_config, $name, $config->get());
            }
            // Ensure that the update hooks updated all entity schema.
            $needs_updates = \Drupal::entityDefinitionUpdateManager()->needsUpdates();
            $this->assertFalse($needs_updates, 'After all updates ran, entity schema is up to date.');
            if ($needs_updates) {
                foreach (\Drupal::entityDefinitionUpdateManager()->getChangeSummary() as $entity_type_id => $summary) {
                    foreach ($summary as $message) {
                        $this->fail($message);
                    }
                }
            }
        }
    }
    
    /**
     * Runs the install database tasks for the driver used by the test runner.
     */
    protected function runDbTasks() {
        // Create a minimal container so that t() works.
        // @see install_begin_request()
        $container = new ContainerBuilder();
        $container->setParameter('language.default_values', Language::$defaultValues);
        $container->register('language.default', 'Drupal\\Core\\Language\\LanguageDefault')
            ->addArgument('%language.default_values%');
        $container->register('string_translation', 'Drupal\\Core\\StringTranslation\\TranslationManager')
            ->addArgument(new Reference('language.default'));
        \Drupal::setContainer($container);
        require_once __DIR__ . '/../../../../../includes/install.inc';
        $connection = Database::getConnection();
        $errors = db_installer_object($connection->driver())
            ->runTasks();
        if (!empty($errors)) {
            $this->fail('Failed to run installer database tasks: ' . implode(', ', $errors));
        }
    }
    
    /**
     * Replace User 1 with the user created here.
     */
    protected function replaceUser1() {
        
        /** @var \Drupal\user\UserInterface $account */
        // @todo: Saving the account before the update is problematic.
        //   https://www.drupal.org/node/2560237
        $account = User::load(1);
        $account->setPassword($this->rootUser->pass_raw);
        $account->setEmail($this->rootUser
            ->getEmail());
        $account->setUsername($this->rootUser
            ->getAccountName());
        $account->save();
    }
    
    /**
     * Tests the selection page.
     */
    protected function doSelectionTest() {
        // No-op. Tests wishing to do test the selection page or the general
        // update.php environment before running update.php can override this method
        // and implement their required tests.
    }

}