public function maxAgeAndSMaxAgeIsRenderedCorrectly()
{
$headers = new Headers();
$headers->setCacheControlDirective('max-age', 120);
$this->assertEquals('max-age=120', $headers->get('Cache-Control'));
$headers->setCacheControlDirective('s-maxage', 60);
$this->assertEquals('max-age=120, s-maxage=60', $headers->get('Cache-Control'));
$headers->removeCacheControlDirective('max-age');
$this->assertEquals('s-maxage=60', $headers->get('Cache-Control'));
$headers->removeCacheControlDirective('s-maxage');
$this->assertEquals(null, $headers->get('Cache-Control'));
}