[2.3] Remove useless tests skips

Author: nicolas-grekas

Tests/Functional/WebTestCase.php

@@ -23,15 +23,6 @@ public static function assertRedirect($response, $location)
         self::assertEquals('http://localhost'.$location, $response->headers->get('Location'));
     }
 
-    protected function setUp()
-    {
-        if (!class_exists('Twig_Environment')) {
-            $this->markTestSkipped('Twig is not available.');
-        }
-
-        parent::setUp();
-    }
-
     protected function deleteTmpDir($testCase)
     {
         if (!file_exists($dir = sys_get_temp_dir().'/'.Kernel::VERSION.'/'.$testCase)) {