public function testGetValueHash()
{
$list = new HashableObjectStorage();
$originalList = clone $list;
$hash = $list->getValueHash();
$this->assertInternalType('string', $hash);
$one = new HashableObject(1);
$two = new HashableObject(1);
$list->attach($one);
$list->attach($two);
$newHash = $list->getValueHash();
$this->assertNotEquals($hash, $newHash, 'The hash of HashableObjectStorage with different content should be different');
$this->assertFalse($list->equals($originalList));
$originalList = clone $list;
$list->detach($one);
$list->detach($two);
$list->attach($two);
$list->attach($one);
$this->assertEquals($newHash, $list->getValueHash(), 'The hash of HashableObjectStorage with the same elements in different order should be the same');
$this->assertTrue($list->equals($originalList));
$list->detach($one);
$list->detach($two);
$list->attach(new HashableObject(1));
$list->attach(new HashableObject(1));
$this->assertEquals($newHash, $list->getValueHash(), 'The hash of HashableObjectStorage with different instances of the same elemnets should be the same');
$this->assertTrue($list->equals($originalList));
}
/**
* @see SplObjectStorage::attach
*
* @param Reference $reference
* @param mixed $data Unused in the ReferenceList class.
*/
public function attach($reference, $data = null)
{
if (!$reference->isEmpty()) {
parent::attach($reference, $data);
}
}