only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/config/lib/Drupal/config/Tests/LocaleConfigOverride.php
@@ -0,0 +1,43 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\config\Tests\LocaleConfigOverride.
+ */
+
+namespace Drupal\config\Tests;
+
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Tests locale config override.
+ */
+class LocaleConfigOverride extends WebTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('locale', 'config_test');
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Locale override',
+      'description' => 'Confirm that locale overrides work',
+      'group' => 'Configuration',
+    );
+  }
+
+  function testLocaleConfigOverride() {
+    $name = 'config_test.system';
+    // Verify the default configuration values exist.
+    $config = config($name);
+    $this->assertIdentical($config->get('foo'), 'bar');
+    // Spoof multilingual.
+    $GLOBALS['conf']['language_count'] = 2;
+    drupal_language_initialize();
+    $config = config($name);
+    $this->assertIdentical($config->get('foo'), 'en bar');
+  }
+}
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/config/tests/config_test/config/locale.config.en.config_test.system.yml
@@ -0,0 +1 @@
+foo: en bar