public function testIsEmpty()
{
$emptyReference = new Reference();
$this->assertTrue($emptyReference->isEmpty());
$referenceWithSnak = new Reference(array(new PropertyNoValueSnak(1)));
$this->assertFalse($referenceWithSnak->isEmpty());
$referenceWithSnaks = new Reference(array(new PropertyNoValueSnak(1), new PropertyNoValueSnak(2)));
$this->assertFalse($referenceWithSnaks->isEmpty());
}
/**
* @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);
}
}
