Issue #3406697 by alexpott, chr.fritsch: Fix notice in...

    if (is_object($file)) {

      $filename = $file->filename;

      preg_match('/drupal-([0-9a-z\.-]+)\.' . $langcode . '\.po/', $filename, $matches);

      // Get the version information.

      if ($version = $matches[1]) {

      // Get the version information. Custom translation files may not have a

      // version number.

      if (isset($matches[1]) && $version = $matches[1]) {

        $info = _install_get_version_info($version);

        // Picking the first file does not necessarily result in the right file. So

        // we check if at least the major version number is available.

<?php

namespace Drupal\FunctionalTests\Installer;

use Drupal\Tests\BrowserTestBase;

/**

 * Tests non-standard named translation files get imported during install.

 *

 * @group Installer

 */

class InstallerTranslationNonStandardFilenamesTest extends InstallerTranslationMultipleLanguageNonInteractiveTest {

  /**

   * {@inheritdoc}

   */

  protected function prepareEnvironment() {

    BrowserTestBase::prepareEnvironment();

    // Place custom local translations in the translations directory.

    mkdir(DRUPAL_ROOT . '/' . $this->siteDirectory . '/files/translations', 0777, TRUE);

    file_put_contents(DRUPAL_ROOT . '/' . $this->siteDirectory . '/files/translations/drupal.de.po', $this->getPo('de'));

    file_put_contents(DRUPAL_ROOT . '/' . $this->siteDirectory . '/files/translations/drupal.es.po', $this->getPo('es'));

  }

  /**

   * {@inheritdoc}

   */

  protected function prepareSettings() {

    parent::prepareSettings();

    $settings['config']['locale.settings']['translation']['default_filename'] = (object) [

      'value' => '%project.%language.po',

      'required' => TRUE,

    ];

    $settings['config']['locale.settings']['translation']['default_server_pattern'] = (object) [

      'value' => 'translations://%project.%language.po',

      'required' => TRUE,

    ];

    $this->writeSettings($settings);

  }

}