PayPal\Api\Error::getPurchaseUnitReferenceId PHP Method

    public function getPurchaseUnitReferenceId()
    {
        return $this->purchase_unit_reference_id;
    }

 /**
  * @depends testSerializationDeserialization
  * @param Error $obj
  */
 public function testGetters($obj)
 {
     $this->assertEquals($obj->getName(), "TestSample");
     $this->assertEquals($obj->getPurchaseUnitReferenceId(), "TestSample");
     $this->assertEquals($obj->getDebugId(), "TestSample");
     $this->assertEquals($obj->getMessage(), "TestSample");
     $this->assertEquals($obj->getCode(), "TestSample");
     $this->assertEquals($obj->getInformationLink(), "TestSample");
     $this->assertEquals($obj->getDetails(), ErrorDetailsTest::getObject());
     $this->assertEquals($obj->getLinks(), LinksTest::getObject());
 }