implement feedback

src/Silex/Application.php

@@ -439,7 +439,7 @@ class Application extends \Pimple implements HttpKernelInterface, TerminableInte
     public function sendFile($file, $status = 200, $headers = array(), $contentDisposition = null)
     {
         if (!class_exists('Symfony\Component\HttpFoundation\BinaryFileResponse')) {
-            throw new \RuntimeException('This feature is only supported as of Http Foundation 2.2.');
+            throw new \RuntimeException('The "senfFile" method is only supported as of Http Foundation 2.2.');
         }
 
         return new BinaryFileResponse($file, $status, $headers, true, $contentDisposition);

tests/Silex/Tests/ApplicationTest.php

@@ -493,7 +493,7 @@ class ApplicationTest extends \PHPUnit_Framework_TestCase
         $app = new Application();
 
         try {
-            $response = $app->sendFile(__FILE__, 200, array('Content-Type: application/php'), null);
+            $response = $app->sendFile(__FILE__, 200, array('Content-Type: application/php'));
             $this->assertInstanceOf('Symfony\Component\HttpFoundation\BinaryFileResponse', $response);
             $this->assertEquals(__FILE__, (string) $response->getFile());
         } catch (\RuntimeException $e) {