public function testSetIdTypeAffectsSearchIndex($idType, $expectedSearchIndex)
{
$lookup = new Lookup();
$lookup->setIdType($idType);
$parameters = $lookup->getOperationParameter();
if ($expectedSearchIndex === null) {
$this->assertArrayNotHasKey('SearchIndex', $parameters);
} else {
$this->assertSame($expectedSearchIndex, $parameters['SearchIndex']);
}
}