public function testChainability()
{
$lastModified = new \DateTime(null, new \DateTimeZone('GMT'));
$lastModified->setTimestamp(1);
$this->childResponse->setEtag('hi')->setStatus(Http::STATUS_NOT_FOUND)->setLastModified($lastModified)->cacheFor(33)->addHeader('hello', 'world');
$headers = $this->childResponse->getHeaders();
$this->assertEquals('world', $headers['hello']);
$this->assertEquals(Http::STATUS_NOT_FOUND, $this->childResponse->getStatus());
$this->assertEquals('hi', $this->childResponse->getEtag());
$this->assertEquals('Thu, 01 Jan 1970 00:00:01 +0000', $headers['Last-Modified']);
$this->assertEquals('max-age=33, must-revalidate', $headers['Cache-Control']);
}
