diff --git a/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php b/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
index cf162fd..608318e 100644
--- a/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
+++ b/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
@@ -1053,15 +1053,6 @@ private function prepareEnvironment() {
     // Reset and create a new service container.
     $this->container = new ContainerBuilder();
 
-    // @todo Remove this once this class has no calls to t() and format_plural()
-    $this->container->setParameter('language.default_values', Language::$defaultValues);
-    $this->container->register('language.default', 'Drupal\Core\Language\LanguageDefault')
-      ->addArgument('%language.default_values%');
-    $this->container->register('language_manager', 'Drupal\Core\Language\LanguageManager')
-      ->addArgument(new Reference('language.default'));
-    $this->container->register('string_translation', 'Drupal\Core\StringTranslation\TranslationManager')
-      ->addArgument(new Reference('language_manager'));
-
     // Register info parser.
     $this->container->register('info_parser', 'Drupal\Core\Extension\InfoParser');