Fatal error: Uncaught Error: Class "Drupal\FunctionalTests\Installer\InstallerTestBase" not found in /home/qcsvlel/www/core/profiles/demo_umami/tests/src/Functional/UmamiMultilingualInstallTest.php:15 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/profiles/demo_umami/tests/src/Functional/UmamiMultilingualInstallTest.php on line 15