Issue #2991677 by g-brodiei, paulocs, tomhollevoet, raman.b, jonathanshaw,...

use Drupal\Core\Test\AssertMailTrait;

use Drupal\KernelTests\Core\Entity\EntityKernelTestBase;

use Drupal\language\Entity\ConfigurableLanguage;

use Drupal\locale\Locale;

/**

 * Tests _user_mail_notify() use of user.settings.notify.*.

 */

class UserMailNotifyTest extends EntityKernelTestBase {

  /**

   * Modules to enable.

   *

   * @var array

   */

  protected static $modules = [

    'locale',

    'language',

  ];

  use AssertMailTrait {

    getMails as drupalGetMails;

  }

    $this->assertEmpty($this->getMails());

  }

  /**

   * Tests recovery email content and token langcode is aligned.

   */

  public function testUserRecoveryMailLanguage() {

    // Install locale schema.

    $this->installSchema('locale', [

      'locales_source',

      'locales_target',

      'locales_location',

    ]);

    // Add new language for translation purpose.

    ConfigurableLanguage::createFromLangcode('zh-hant')->save();

    ConfigurableLanguage::createFromLangcode('fr')->save();

    // Install configs.

    $this->installConfig(['language', 'locale', 'user']);

    locale_system_set_config_langcodes();

    $langcodes = array_keys(\Drupal::languageManager()->getLanguages());

    $names = Locale::config()->getComponentNames();

    Locale::config()->updateConfigTranslations($names, $langcodes);

    $this->config('user.settings')->set('notify.password_reset', TRUE)->save();

    // Set language prefix.

    $config = $this->config('language.negotiation');

    $config->set('url.prefixes', ['en' => 'en', 'zh-hant' => 'zh', 'fr' => 'fr'])->save();

    // Reset services to apply change.

    \Drupal::service('kernel')->rebuildContainer();

    // Update zh-hant password_reset config with custom translation.

    $configLanguageOverride = $this->container->get('language_manager')->getLanguageConfigOverride('zh-hant', 'user.mail');

    $configLanguageOverride->set('password_reset.subject', 'hant subject [user:display-name]')->save();

    $configLanguageOverride->set('password_reset.body', 'hant body [user:display-name] and token link [user:one-time-login-url]')->save();

    // Update fr password_reset config with custom translation.

    $configLanguageOverride = $this->container->get('language_manager')->getLanguageConfigOverride('fr', 'user.mail');

    $configLanguageOverride->set('password_reset.subject', 'fr subject [user:display-name]')->save();

    $configLanguageOverride->set('password_reset.body', 'fr body [user:display-name] and token link [user:one-time-login-url]')->save();

    // Current language is 'en'.

    $currentLanguage = $this->container->get('language_manager')->getCurrentLanguage()->getId();

    $this->assertSame('en', $currentLanguage);

    // Set preferred_langcode to 'zh-hant'.

    $user = $this->createUser();

    $user->set('preferred_langcode', 'zh-hant')->save();

    $preferredLangcode = $user->getPreferredLangcode();

    $this->assertSame('zh-hant', $preferredLangcode);

    // Recovery email should respect user preferred langcode by default if

    // langcode not set.

    $params['account'] = $user;

    $default_email = \Drupal::service('plugin.manager.mail')->mail('user', 'password_reset', $user->getEmail(), $preferredLangcode, $params);

    $this->assertTrue($default_email['result']);

    // Assert for zh.

    $this->assertMailString('subject', 'hant subject', 1);

    $this->assertMailString('body', 'hant body', 1);

    $this->assertMailString('body', 'zh/user/reset', 1);

    // Recovery email should be fr when langcode specified.

    $french_email = \Drupal::service('plugin.manager.mail')->mail('user', 'password_reset', $user->getEmail(), 'fr', $params);

    $this->assertTrue($french_email['result']);

    // Assert for fr.

    $this->assertMailString('subject', 'fr subject', 1);

    $this->assertMailString('body', 'fr body', 1);

    $this->assertMailString('body', 'fr/user/reset', 1);

  }

}

  $langcode = $message['langcode'];

  $variables = ['user' => $params['account']];

  $language = $language_manager->getLanguage($params['account']->getPreferredLangcode());

  $language = $language_manager->getLanguage($langcode);

  $original_language = $language_manager->getConfigOverrideLanguage();

  $language_manager->setConfigOverrideLanguage($language);

  $mail_config = \Drupal::config('user.mail');