diff --git a/core/modules/config/lib/Drupal/config/Tests/DefaultConfigTest.php b/core/modules/config/lib/Drupal/config/Tests/DefaultConfigTest.php
index bd72223..53a692b 100644
--- a/core/modules/config/lib/Drupal/config/Tests/DefaultConfigTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/DefaultConfigTest.php
@@ -100,6 +100,11 @@ public function testDefaultConfig() {
       $this->configName = $config_name;
       $data = $default_config_storage->read($config_name);
       if (!$typed_config->hasConfigSchema($schema_name)) {
+        // Make sure invalid translation excluded.
+        if ($config_name == 'language.config.xx...') {
+          $this->pass(String::format('!config_name is not valid configuration translation', array('!config_name' => $config_name)));
+          continue;
+        }
         $this->fail(String::format('No schema for !config_name', array('!config_name' => $config_name)));
         continue;
       }
diff --git a/core/modules/config/tests/config_test/config/language.config.xx....yml b/core/modules/config/tests/config_test/config/language.config.xx....yml
new file mode 100644
index 0000000..c36dbf7
--- /dev/null
+++ b/core/modules/config/tests/config_test/config/language.config.xx....yml
@@ -0,0 +1 @@
+foo: fr bar