minor #17929 [Security] added some tests (fabpot)

This PR was merged into the 2.7 branch.

Discussion
----------

[Security] added some tests

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Commits
-------

7aec568 [Security] added some tests

src/Symfony/Component/Security/Core/Tests/Resources/TranslationFilesTest.php

@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Security\Core\Tests\Resources;
+
+class TranslationFilesTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @dataProvider provideTranslationFiles
+     */
+    public function testTranslationFileIsValid($filePath)
+    {
+        \PHPUnit_Util_XML::loadfile($filePath, false, false, true);
+    }
+
+    public function provideTranslationFiles()
+    {
+        return array_map(
+            function ($filePath) { return (array) $filePath; },
+            glob(dirname(dirname(__DIR__)).'/Resources/translations/*.xlf')
+        );
+    }
+}