ApaiIO\Operations\Lookup::getSearchIndex PHP Method

    public function getSearchIndex()
    {
        return $this->getSingleOperationParameter('SearchIndex');
    }

 public function testGetSearchIndex()
 {
     $lookup = new Lookup();
     $this->assertEquals(null, $lookup->getSearchIndex());
     $lookup->setSearchIndex('Appliances');
     $this->assertEquals('Appliances', $lookup->getSearchIndex());
 }