public function testBarDumpWithoutDebug()
 {
     $loader = new Twig_Loader_Filesystem(__DIR__);
     $twig = new Twig_Environment($loader);
     $twig->addExtension(new BarDumpExtension());
     Debugger::$data = [];
     $this->assertSame('', trim($twig->render('BarDump.twig', ['bar' => 'baz'])));
     $this->assertSame('', implode('', Debugger::$data));
 }