diff --git a/src/SemanticScuttle/Service/Vote.php b/src/SemanticScuttle/Service/Vote.php
index 4a5baab..e6d021b 100644
--- a/src/SemanticScuttle/Service/Vote.php
+++ b/src/SemanticScuttle/Service/Vote.php
@@ -163,14 +163,14 @@ class SemanticScuttle_Service_Vote extends SemanticScuttle_DbService
                 '', __LINE__, __FILE__, $query, $this->db
             );
             //FIXME: throw exception
-            return false;
+            return null;
         }
 
         $row = $this->db->sql_fetchrow($dbres);
         $this->db->sql_freeresult($dbres);
 
         if (!$row) {
-            return false;
+            return null;
         }
 
         return (int)$row['count'] == 1;
@@ -282,6 +282,20 @@ class SemanticScuttle_Service_Vote extends SemanticScuttle_DbService
     }
 
 
+
+    /**
+     * Delete all votes from the database table.
+     * Used in unit tests.
+     *
+     * @return void
+     */
+    public function deleteAll()
+    {
+        $query = 'TRUNCATE TABLE `'. $this->getTableName() .'`';
+        $this->db->sql_query($query);
+    }
+
+
 }
 
 ?>
\ No newline at end of file
diff --git a/tests/VoteTest.php b/tests/VoteTest.php
index 90fae48..0196071 100644
--- a/tests/VoteTest.php
+++ b/tests/VoteTest.php
@@ -57,6 +57,7 @@ class VoteTest extends PHPUnit_Framework_TestCase
     {
         //FIXME: create true new instance
         $this->vs = SemanticScuttle_Service_Factory::get('Vote');
+        $this->vs->deleteAll();
     }