some tests for MAP keyword

tests/Query/JoinTestCase.php

@@ -171,4 +171,37 @@ class Doctrine_Query_Join_TestCase extends Doctrine_UnitTestCase
             $this->fail();
         }
     }
+
+    public function testMapKeywordForQueryWithOneComponent()
+    {
+        $q = new Doctrine_Query();
+        $coll = $q->from('Record_City c MAP c.name')->fetchArray();
+        
+        $this->assertTrue(isset($coll['City 1']));
+        $this->assertTrue(isset($coll['City 2']));
+        $this->assertTrue(isset($coll['City 3']));
+    }
+
+    public function testMapKeywordSupportsJoins()
+    {
+        $q = new Doctrine_Query();
+        $country = $q->from('Record_Country c LEFT JOIN c.City c2 MAP c2.name')->fetchOne();
+        $coll = $country->City;
+
+        $this->assertTrue(isset($coll['City 1']));
+        $this->assertTrue(isset($coll['City 2']));
+        $this->assertTrue(isset($coll['City 3']));
+    }
+    
+    public function testMapKeywordThrowsExceptionOnNonExistentColumn()
+    {
+    	try {
+            $q = new Doctrine_Query();
+            $country = $q->from('Record_Country c LEFT JOIN c.City c2 MAP c2.unknown')->fetchOne();
+        
+            $this->fail();
+        } catch (Doctrine_Query_Exception $e) {
+            $this->pass();
+        }
+    }
 }