public function setGetAndGetAllConvertDatesFromDateObjectsToStringAndViceVersa()
{
$now = \DateTime::createFromFormat(DATE_RFC2822, 'Tue, 22 May 2012 12:00:00 +0200');
$nowInGmt = clone $now;
$nowInGmt->setTimezone(new \DateTimeZone('GMT'));
$headers = new Headers();
$headers->set('Last-Modified', $now);
$this->assertEquals($nowInGmt->format(DATE_RFC2822), $headers->get('Last-Modified')->format(DATE_RFC2822));
$headers->set('X-Test-Run-At', $now);
$this->assertEquals($nowInGmt->format(DATE_RFC2822), $headers->get('X-Test-Run-At')->format(DATE_RFC2822));
}