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'));
}