ApaiIO\Operations\SimilarityLookup::getItemId PHP Method

    public function getItemId()
    {
        return $this->getSingleOperationParameter('ItemId');
    }

 public function testGetItemId()
 {
     $lookup = new SimilarityLookup();
     $this->assertEquals(null, $lookup->getItemId());
     $lookup->setItemId('B0117IJ4LE');
     $this->assertEquals('B0117IJ4LE', $lookup->getItemId());
 }