public function testExpire()
{
$response = new Response();
$response->headers->set('Cache-Control', 'max-age=100');
$response->expire();
$this->assertEquals(100, $response->headers->get('Age'), '->expire() sets the Age to max-age when present');
$response = new Response();
$response->headers->set('Cache-Control', 'max-age=100, s-maxage=500');
$response->expire();
$this->assertEquals(500, $response->headers->get('Age'), '->expire() sets the Age to s-maxage when both max-age and s-maxage are present');
$response = new Response();
$response->headers->set('Cache-Control', 'max-age=5, s-maxage=500');
$response->headers->set('Age', '1000');
$response->expire();
$this->assertEquals(1000, $response->headers->get('Age'), '->expire() does nothing when the response is already stale/expired');
$response = new Response();
$response->expire();
$this->assertFalse($response->headers->has('Age'), '->expire() does nothing when the response does not include freshness information');
}
