public function testCacheControlDirectiveAccessors()
{
$bag = new HeaderBag();
$bag->addCacheControlDirective('public');
$this->assertTrue($bag->hasCacheControlDirective('public'));
$this->assertTrue($bag->getCacheControlDirective('public'));
$this->assertEquals('public', $bag->get('cache-control'));
$bag->addCacheControlDirective('max-age', 10);
$this->assertTrue($bag->hasCacheControlDirective('max-age'));
$this->assertEquals(10, $bag->getCacheControlDirective('max-age'));
$this->assertEquals('max-age=10, public', $bag->get('cache-control'));
$bag->removeCacheControlDirective('max-age');
$this->assertFalse($bag->hasCacheControlDirective('max-age'));
}