function testUsed()
{
$hash = new HTMLPurifier_StringHash(array('key' => 'value', 'key2' => 'value2'));
$this->assertIdentical($hash->getAccessed(), array());
$t = $hash->offsetGet('key');
$this->assertIdentical($hash->getAccessed(), array('key' => true));
$hash->resetAccessed();
$this->assertIdentical($hash->getAccessed(), array());
}