1 files changed, 15 insertions, 0 deletions
diff --git a/test/orm/mapper.py b/test/orm/mapper.py
index 5cf665fd4..49b5a0cbc 100644
--- a/test/orm/mapper.py
+++ b/test/orm/mapper.py
@@ -101,6 +101,21 @@ class MapperTest(MapperSuperTest):
         finally:
             table.drop()
 
+    def testpropconflict(self):
+        """test that a backref created against an existing mapper with a property name
+        conflict raises a decent error message"""
+        mapper(Address, addresses)
+        mapper(User, users,
+            properties={
+            'addresses':relation(Address, backref='email_address')
+        })
+        try:
+            class_mapper(Address)
+            class_mapper(User)
+            assert False
+        except exceptions.ArgumentError:
+            pass
+        
     def testrefresh(self):
         mapper(User, users, properties={'addresses':relation(mapper(Address, addresses))})
         s = create_session()