Fatal error: Uncaught Error: Class "Drupal\migrate\Plugin\migrate\id_map\Sql" not found in /home/www/drupal8/test/core/modules/migrate/tests/src/Unit/TestSqlIdMap.php:14 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/migrate/tests/src/Unit/TestSqlIdMap.php on line 14