public function testConvert()
 {
     $controller = new Controller(new Route('/foo/{bar}'));
     $ret = $controller->convert('bar', $func = function ($bar) {
         return $bar;
     });
     $this->assertSame($ret, $controller);
     $this->assertEquals(array('bar' => $func), $controller->getRoute()->getOption('_converters'));
 }