protected function setUp()
 {
     parent::setUp();
     $this->wikibaseRepo = WikibaseRepo::getDefaultInstance();
     $this->entityPerPageTable = $this->wikibaseRepo->getStore()->newEntityPerPage();
     $this->clearTables();
     $items = $this->addItems();
     if ($this->countPages() !== count($items)) {
         throw new RuntimeException('Page count must be equal to item count.');
     }
     $this->entityPerPageRows = $this->getEntityPerPageData();
 }