refs #681 : adding failing test case

tests/Query/OrderbyTestCase.php

@@ -53,4 +53,15 @@ class Doctrine_Query_Orderby_TestCase extends Doctrine_UnitTestCase
 
         $this->assertEqual($q->getQuery(), 'SELECT e.id AS e__id, e.name AS e__name, COUNT(p.phonenumber) AS p__0 FROM entity e LEFT JOIN phonenumber p ON e.id = p.entity_id WHERE (e.type = 0) ORDER BY p__0 DESC');
     }
+    /* ticket #681 */
+    public function testOrderByWithCoalesce()
+    {
+        $q = new Doctrine_Query();
+        
+        $q->select('u.name')
+          ->from('User u')
+          ->orderby('COALESCE(u.id, u.name) DESC');
+        // nonesese results expected, but query is syntatically ok.
+        $this->assertEqual($q->getQuery(), 'SELECT e.id AS e__id, e.name AS e__name FROM entity e WHERE (e.type = 0) ORDER BY COALESCE(e__id, e__name) DESC');
+    }
 }