diff --git a/core/tests/Drupal/KernelTests/Setup/Commands/SetupDrupalTestScriptTest.php b/core/tests/Drupal/KernelTests/Setup/Commands/SetupDrupalTestScriptTest.php
index 3dc6500b20..6cbe5c9128 100644
--- a/core/tests/Drupal/KernelTests/Setup/Commands/SetupDrupalTestScriptTest.php
+++ b/core/tests/Drupal/KernelTests/Setup/Commands/SetupDrupalTestScriptTest.php
@@ -171,6 +171,9 @@ public function testInstallInDifferentLanguage() {
         'interactive' => FALSE,
       ]
     );
+
+    // Ensure that all the tables for this DB prefix are gone.
+    $this->assertCount(0, \Drupal::database()->schema()->findTables($db_prefix . '%'));
   }
 
 }