Fatal error: Uncaught Error: Class "Drupal\Tests\BrowserTestBase" not found in /home/fnbrshareacopy/public_html/modules/contrib/entity_reference_revisions/tests/src/Functional/EntityReferenceRevisionsAdminTest.php:15 Stack trace: #0 {main} thrown in /home/fnbrshareacopy/public_html/modules/contrib/entity_reference_revisions/tests/src/Functional/EntityReferenceRevisionsAdminTest.php on line 15