fixed validator test

tests/Silex/Tests/Provider/ValidatorServiceProviderTest.php

@@ -19,6 +19,8 @@ use Symfony\Component\Translation\Exception\NotFoundResourceException;
 use Symfony\Component\Validator\Constraints as Assert;
 use Silex\Tests\Provider\ValidatorServiceProviderTest\Constraint\Custom;
 use Silex\Tests\Provider\ValidatorServiceProviderTest\Constraint\CustomValidator;
+use Symfony\Component\Validator\ValidatorInterface as LegacyValidatorInterface;
+use Symfony\Component\Validator\Validator\ValidatorInterface;
 
 /**
  * ValidatorServiceProvider.
@@ -83,7 +85,7 @@ class ValidatorServiceProviderTest extends \PHPUnit_Framework_TestCase
      */
     public function testValidatorServiceIsAValidator($app)
     {
-        $this->assertInstanceOf('Symfony\Component\Validator\ValidatorInterface', $app['validator']);
+        $this->assertTrue($app['validator'] instanceof ValidatorInterface || $app['validator'] instanceof LegacyValidatorInterface );
     }
 
     /**