Fatal error: Uncaught Error: Class "Drupal\Tests\migrate\Unit\MigrateTestCase" not found in /home/qcsvlel/www/core/modules/file/tests/src/Unit/Plugin/migrate/process/d6/FileUriTest.php:16 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/file/tests/src/Unit/Plugin/migrate/process/d6/FileUriTest.php on line 16