/**
  * @magentoDbIsolation enabled
  */
 public function testAddEntitySummaryToItemEmpty()
 {
     foreach ($this->collection->getItems() as $item) {
         $item->delete();
     }
     $this->collection->clear();
     $result = $this->collection->addEntitySummaryToItem(1, 1);
     $this->assertEquals($this->collection, $result);
 }