getRowsNeedingUpdate example

$id_map->saveIdMapping($row, $destination, $status);
      $expected_results[] = [
        'sourceid1' => 'source_value_' . $status,
        'source_ids_hash' => $this->getIdMap()->getSourceIdsHash($source),
        'destid1' => 'destination_value_' . $status,
        'source_row_status' => $status,
        'rollback_action' => MigrateIdMapInterface::ROLLBACK_DELETE,
        'hash' => '',
      ];
      // Assert zero rows need an update.       if ($status == MigrateIdMapInterface::STATUS_IMPORTED) {
        $rows_needing_update = $id_map->getRowsNeedingUpdate(1);
        $this->assertCount(0, $rows_needing_update);
      }
    }
    // Assert that test values exist.     $this->queryResultTest($this->getIdMapContents(), $expected_results);

    // Assert a single row needs an update.     $row_needing_update = $id_map->getRowsNeedingUpdate(1);
    $this->assertCount(1, $row_needing_update);

    // Assert the row matches its original source.