public function testTagsAreCleanedOnDelete()
{
$pool = $this->createCachePool();
$i = $pool->getItem('k');
$pool->save($i->tag('foo'));
$pool->deleteItem('k');
$pool->save($pool->getItem('k'));
$pool->invalidateTags(array('foo'));
$this->assertTrue($pool->getItem('k')->isHit());
}