diff --git a/tests/phpunit/CiviTest/CiviUnitTestCase.php b/tests/phpunit/CiviTest/CiviUnitTestCase.php
index 471d39937ce3..f40a07df21e3 100644
--- a/tests/phpunit/CiviTest/CiviUnitTestCase.php
+++ b/tests/phpunit/CiviTest/CiviUnitTestCase.php
@@ -482,6 +482,8 @@ protected function tearDown() {
 
     $this->cleanTempDirs();
     $this->unsetExtensionSystem();
+    $this->assertEquals([], CRM_Core_DAO::$_nullArray);
+    $this->assertEquals(NULL, CRM_Core_DAO::$_nullObject);
   }
 
   /**