public function testGivenTwoEmptyItems_emptyItemDiffIsReturned()
{
$differ = new ItemDiffer();
$diff = $differ->diffEntities(new Item(), new Item());
$this->assertInstanceOf('Wikibase\\DataModel\\Services\\Diff\\ItemDiff', $diff);
$this->assertTrue($diff->isEmpty());
}
private function makeDiff($objectId, $revA, $revB)
{
$entityClasses = array(Item::ENTITY_TYPE => 'Wikibase\\DataModel\\Entity\\Item');
$lookup = $this->getEntityRevisionLookup();
$entityFactory = new EntityFactory($entityClasses);
$itemId = new ItemId($objectId);
if ($revA === 0) {
$oldEntity = $entityFactory->newEmpty(Item::ENTITY_TYPE);
} else {
$oldEntity = $lookup->getEntityRevision($itemId, $revA)->getEntity();
}
if ($revB === 0) {
$newEntity = $entityFactory->newEmpty(Item::ENTITY_TYPE);
} else {
$newEntity = $lookup->getEntityRevision($itemId, $revB)->getEntity();
}
$differ = new ItemDiffer();
return $differ->diffEntities($oldEntity, $newEntity);
}
