diff --git a/tests/HTMLPurifier/HTMLDefinitionTest.php b/tests/HTMLPurifier/HTMLDefinitionTest.php
index d64daf6f..28fb28cc 100644
--- a/tests/HTMLPurifier/HTMLDefinitionTest.php
+++ b/tests/HTMLPurifier/HTMLDefinitionTest.php
@@ -13,6 +13,11 @@ class HTMLPurifier_HTMLDefinitionTest extends HTMLPurifier_Harness
         // counterpart is not. This is generally a good thing for users,
         // but it's a slight internal inconsistency
         
+        $this->assertEqual(
+            $def->parseTinyMCEAllowedList(''),
+            array(array(), array())
+        );
+        
         $this->assertEqual(
             $def->parseTinyMCEAllowedList('a,b,c'),
             array(array('a' => true, 'b' => true, 'c' => true), array())