diff --git a/core/modules/system/src/Tests/Module/ConfigLangTypeTest.php b/core/modules/system/src/Tests/Module/ConfigLangTypeTest.php
new file mode 100644
index 0000000..a19a8c8
--- /dev/null
+++ b/core/modules/system/src/Tests/Module/ConfigLangTypeTest.php
@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\system\Tests\Module\ConfigLangTypeTest.
+ */
+
+namespace Drupal\system\Tests\Module;
+
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Tests alterations to language types.
+ *
+ * @group language
+ */
+class ConfigLangTypeTest extends WebTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('language', 'content_translation');
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Create and login user.
+    $admin_user = $this->drupalCreateUser(array('administer languages'));
+    $this->drupalLogin($admin_user);
+  }
+
+  /**
+   * Tests alteration config of configurable language types.
+   */
+  function testConfigLangTypeAlterations() {
+
+    // Default of config.
+    $test_type = LanguageInterface::TYPE_CONTENT;
+    $this->assertTrue(!$this->checkTypeConfigurable($test_type), 'Language type is not configurable.');
+
+    // Editing config.
+    $edit = [$test_type . '[configurable]' => TRUE];
+    $this->drupalPostForm('admin/config/regional/language/detection', $edit, t('Save settings'));
+    $this->assertTrue($this->checkTypeConfigurable($test_type), 'Language type is now configurable.');
+
+    // After installing another module, the config should be the same.
+    $this->container->get('module_installer')->install(array('field'));
+    $this->assertTrue($this->checkTypeConfigurable($test_type), 'Language type is still configurable.');
+
+  }
+
+  /**
+   * Checks whether the given language type is configurable.
+   *
+   * @param $type
+   * @return bool
+   */
+  protected function checkTypeConfigurable($type) {
+    $configurable_types = $this->config('language.types')->get('configurable');
+    return in_array($type, $configurable_types);
+  }
+}