diff --git a/core/modules/config/src/Tests/ConfigImporterTest.php b/core/modules/config/src/Tests/ConfigImporterTest.php
index a08d288..00c5a1f 100644
--- a/core/modules/config/src/Tests/ConfigImporterTest.php
+++ b/core/modules/config/src/Tests/ConfigImporterTest.php
@@ -32,7 +32,7 @@ class ConfigImporterTest extends KernelTestBase {
    *
    * @var array
    */
-  public static $modules = array('config_test', 'system', 'config_import_test');
+  public static $modules = array('config_test', 'system', 'config_import_test', 'config_test_language');
 
   protected function setUp() {
     parent::setUp();
@@ -544,10 +544,10 @@ function testIsInstallable() {
    */
   function testLanguage() {
     // Test imported configuration with implicit language code.
-    $data = $this->container->get('config.storage.installer')->read('config_test.dynamic.dotted.default');
+    $data = $this->container->get('config.storage.installer')->read('config_test.dynamic.dotted.english');
     $this->assertTrue(!isset($data['langcode']));
     $this->assertEqual(
-      $this->config('config_test.dynamic.dotted.default')->get('langcode'),
+      $this->config('config_test.dynamic.dotted.english')->get('langcode'),
       'en'
     );
 
diff --git a/core/modules/config/tests/config_test/config/install/config_test.dynamic.dotted.french.yml b/core/modules/config/tests/config_test/config/install/config_test.dynamic.dotted.french.yml
index 9c43f67..e69de29 100644
--- a/core/modules/config/tests/config_test/config/install/config_test.dynamic.dotted.french.yml
+++ b/core/modules/config/tests/config_test/config/install/config_test.dynamic.dotted.french.yml
@@ -1,5 +0,0 @@
-id: dotted.french
-label: Default
-weight: 0
-protected_property: Default
-langcode: fr
diff --git a/core/modules/config/tests/config_test_language/config/install/config_test.dynamic.dotted.english.yml b/core/modules/config/tests/config_test_language/config/install/config_test.dynamic.dotted.english.yml
new file mode 100644
index 0000000..3470aff
--- /dev/null
+++ b/core/modules/config/tests/config_test_language/config/install/config_test.dynamic.dotted.english.yml
@@ -0,0 +1,6 @@
+id: dotted.english
+label: Default
+weight: 0
+protected_property: Default
+# Used for testing default language code on imported config entities.
+# langcode: en
diff --git a/core/modules/config/tests/config_test_language/config/install/config_test.dynamic.dotted.french.yml b/core/modules/config/tests/config_test_language/config/install/config_test.dynamic.dotted.french.yml
new file mode 100644
index 0000000..9c43f67
--- /dev/null
+++ b/core/modules/config/tests/config_test_language/config/install/config_test.dynamic.dotted.french.yml
@@ -0,0 +1,5 @@
+id: dotted.french
+label: Default
+weight: 0
+protected_property: Default
+langcode: fr
diff --git a/core/modules/config/tests/config_test_language/config_test_language.info.yml b/core/modules/config/tests/config_test_language/config_test_language.info.yml
new file mode 100644
index 0000000..28d720b
--- /dev/null
+++ b/core/modules/config/tests/config_test_language/config_test_language.info.yml
@@ -0,0 +1,5 @@
+name: 'Configuration test languages'
+type: module
+package: Testing
+version: VERSION
+core: 8.x