language_config.diff

diff --git a/core/modules/language/lib/Drupal/language/Tests/LanguageConfigSchemaTest.php b/core/modules/language/lib/Drupal/language/Tests/LanguageConfigSche
index 2a5d8f5..dfeb8b2 100644
--- a/core/modules/language/lib/Drupal/language/Tests/LanguageConfigSchemaTest.php
+++ b/core/modules/language/lib/Drupal/language/Tests/LanguageConfigSchemaTest.php
@@ -51,6 +51,10 @@ function setUp() {
    * Tests whether the language config schema is valid.
    */
   function testValidLanguageConfigSchema() {
+    // Make sure no language configuration available by default.
+    $config_data = \Drupal::config('language.settings')->get();
+    $this->assertTrue(empty($config_data));
+
     $settings_path = 'admin/config/regional/content-language';

     // Enable translation for menu link.
@@ -63,7 +67,14 @@ function testValidLanguageConfigSchema() {
     $edit['settings[user][user][settings][language][langcode]'] = 'en';

     $this->drupalPostForm($settings_path, $edit, t('Save'));
-    $this->assertConfigSchema(\Drupal::service('config.typed'), 'language.settings', \Drupal::config('language.settings')->get());
+
+    $config_data = \Drupal::config('language.settings')->get();
+    // Make sure configuration saved correctly.
+    $this->assertNotNull($config_data['entities']);
+    $menu_link_config = $config_data['entities']['menu_link']['menu_link']['language']['default_configuration'];
+    $this->assertTrue($menu_link_config['language_show']);
+
+    $this->assertConfigSchema(\Drupal::service('config.typed'), 'language.settings', $config_data);
   }

 }