Stop using numeric entity IDs

Author: thiemowmde

tests/unit/Serializers/ItemSerializerTest.php

@@ -4,6 +4,7 @@
 
 use Serializers\Serializer;
 use Wikibase\DataModel\Entity\Item;
+use Wikibase\DataModel\Entity\ItemId;
 use Wikibase\DataModel\Entity\Property;
 use Wikibase\DataModel\Serializers\ItemSerializer;
 use Wikibase\DataModel\SiteLink;
@@ -119,8 +120,7 @@ public function serializationProvider() {
 			],
 		];
 
-		$entity = new Item();
-		$entity->setId( 42 );
+		$entity = new Item( new ItemId( 'Q42' ) );
 		$provider[] = [
 			[
 				'type' => 'item',

tests/unit/Serializers/PropertySerializerTest.php

@@ -5,6 +5,7 @@
 use Serializers\Serializer;
 use Wikibase\DataModel\Entity\Item;
 use Wikibase\DataModel\Entity\Property;
+use Wikibase\DataModel\Entity\PropertyId;
 use Wikibase\DataModel\Serializers\PropertySerializer;
 use Wikibase\DataModel\Snak\PropertyNoValueSnak;
 use Wikibase\DataModel\Statement\StatementList;
@@ -115,8 +116,7 @@ public function serializationProvider() {
 			],
 		];
 
-		$property = Property::newFromType( 'string' );
-		$property->setId( 42 );
+		$property = new Property( new PropertyId( 'P42' ), null, 'string' );
 		$provider[] = [
 			[
 				'type' => 'property',