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.
   */
  abstract protected 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.
  }

}