Hey,
Constructing entities from their serialization in tests has long been discouraged. A few weeks back we removed support for this on the master branch of DataModel. In going though the remaining occurrences, I find myself surprised that some got introduced as little as two weeks ago, and merged in by a member of the Wikidata team.
What to not do:
$item = new Item( array( .... ) );
What to do instead (as has been done in most places for quite some time):
$item = Item::newEmpty(); $item->setStuff();
Cheers
-- Jeroen De Dauw - http://www.bn2vs.com Software craftsmanship advocate Evil software architect at Wikimedia Germany ~=[,,_,,]:3