public function testCssProcessAssets()
{
$app = $this->getApp();
$stylesheet = (new Stylesheet())->setFileName('testfile.css');
$app['asset.queue.file']->add($stylesheet);
$response = new Response($this->template);
$app['asset.queue.file']->process($this->getRequest(), $response);
$this->assertEquals($this->html($this->expectedCss), $this->html($response->getContent()));
}