public function testGetMaxAge()
{
$response = new Response();
$response->headers->set('Cache-Control', 's-maxage=600, max-age=0');
$this->assertEquals(600, $response->getMaxAge(), '->getMaxAge() uses s-maxage cache control directive when present');
$response = new Response();
$response->headers->set('Cache-Control', 'max-age=600');
$this->assertEquals(600, $response->getMaxAge(), '->getMaxAge() falls back to max-age when no s-maxage directive present');
$response = new Response();
$response->headers->set('Cache-Control', 'must-revalidate');
$response->headers->set('Expires', $this->createDateTimeOneHourLater()->format(DATE_RFC2822));
$this->assertEquals(3600, $response->getMaxAge(), '->getMaxAge() falls back to Expires when no max-age or s-maxage directive present');
$response = new Response();
$this->assertNull($response->getMaxAge(), '->getMaxAge() returns null if no freshness information available');
}
