diff -u b/core/modules/simpletest/src/WebTestBase.php b/core/modules/simpletest/src/WebTestBase.php
--- b/core/modules/simpletest/src/WebTestBase.php
+++ b/core/modules/simpletest/src/WebTestBase.php
@@ -934,7 +934,6 @@
     $connection_info = Database::getConnectionInfo();
     $driver = $connection_info['default']['driver'];
     $connection_info['default']['prefix'] = $connection_info['default']['prefix']['default'];
-
     unset($connection_info['default']['driver']);
     unset($connection_info['default']['namespace']);
     unset($connection_info['default']['pdo']);