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diff --git a/web/core/lib/Drupal/Core/Test/TestSetupTrait.php b/web/core/lib/Drupal/Core/Test/TestSetupTrait.php
index 44409078d..062569102 100644
--- a/web/core/lib/Drupal/Core/Test/TestSetupTrait.php
+++ b/web/core/lib/Drupal/Core/Test/TestSetupTrait.php
@@ -158,6 +158,9 @@ trait TestSetupTrait {
     // If the test is run with argument dburl then use it.
     $db_url = getenv('SIMPLETEST_DB');
     if (!empty($db_url)) {
+      // Ensure no existing database gets in the way. If a default database
+      // exists already it must be removed.
+      Database::removeConnection('default');
       $database = Database::convertDbUrlToConnectionInfo($db_url, isset($this->root) ? $this->root : DRUPAL_ROOT);
       Database::addConnectionInfo('default', 'default', $database);
     }