Added tests for Validator Provider

tests/Silex/Tests/Provider/ValidatorServiceProviderTest.php

+<?php
+
+/*
+ * This file is part of the Silex framework.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+namespace Silex\Tests\Provider;
+
+use Silex\Application;
+use Silex\Provider\ValidatorServiceProvider;
+
+/**
+ * ValidatorServiceProvider
+ *
+ * Javier Lopez <f12loalf@gmail.com>
+ */
+class ValidatorServiceProviderTest extends \PHPUnit_Framework_TestCase
+{
+    public function setUp()
+    {
+        if (!is_dir(__DIR__.'/../../../../vendor/Symfony/Component/Validator')) {
+            $this->markTestSkipped('Validator submodule was not installed.');
+        }
+    }
+
+    public function testRegister()
+    {
+        $app = new Application();
+
+        $app->register(new ValidatorServiceProvider(), array(
+            'validator.class_path' =>  __DIR__.'/../../../../vendor/Symfony/Component/Validator'
+        ));
+
+        return $app;
+    }
+
+    /**
+     * @depends testRegister
+     */
+    public function testValidatorServiceIsAValidator($app)
+    {
+        $this->assertInstanceOf('Symfony\Component\Validator\Validator', $app['validator']);
+    }
+}