diff --git a/core/modules/language/tests/src/Kernel/LanguageConfigFactoryOverrideTest.php b/core/modules/language/tests/src/Kernel/LanguageConfigFactoryOverrideTest.php
new file mode 100644
index 0000000..b8b31a9
--- /dev/null
+++ b/core/modules/language/tests/src/Kernel/LanguageConfigFactoryOverrideTest.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Drupal\Tests\language\Kernel;
+
+use Drupal\language\Entity\ConfigurableLanguage;
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests \Drupal\language\Config\LanguageConfigFactoryOverride.
+ *
+ * @group language
+ */
+class LanguageConfigFactoryOverrideTest extends KernelTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('system', 'language');
+
+  /**
+   * Tests language.config_factory_override service has the default language.
+   */
+  public function testLanguageConfigFactoryOverride() {
+    $this->installConfig('system');
+    $this->installConfig('language');
+
+    /** @var \Drupal\language\Config\LanguageConfigFactoryOverride $config_factory_override */
+    $config_factory_override = \Drupal::service('language.config_factory_override');
+    $this->assertEquals('en', $config_factory_override->getLanguage()->getId());
+
+    ConfigurableLanguage::createFromLangcode('de')->save();
+
+    // Invalidate the container.
+    $this->config('system.site')->set('default_langcode', 'de')->save();
+    drupal_flush_all_caches();
+
+    $config_factory_override = \Drupal::service('language.config_factory_override');
+    $this->assertEquals('de', $config_factory_override->getLanguage()->getId());
+  }
+
+}