ApaiIO\Operations\Lookup::setItemIds PHP Method

    public function setItemIds(array $itemIds)
    {
        if (count($itemIds) > 10) {
            throw new \Exception('setItemIds accepts not more then 10 itemid\'s at once');
        }
        $asinString = implode(',', $itemIds);
        $this->setItemId($asinString);
        return $this;
    }

 public function testMultiItemSet()
 {
     $lookup = new Lookup();
     $lookup->setItemIds([1, 2, 3, 4]);
     $itemQuery = $lookup->getItemId();
     $this->assertSame('1,2,3,4', $itemQuery);
 }