diff --git a/proteus/tests/test_model.py b/proteus/tests/test_model.py
index d2f910ca56..fe2d4130c9 100644
--- a/proteus/tests/test_model.py
+++ b/proteus/tests/test_model.py
@@ -256,4 +256,13 @@ class TestModel(TestCase):
         test.save()
         self.assert_(test.delete())
 
-    # TODO test on_change
+    def test_on_change(self):
+        Trigger = Model.get('ir.trigger')
+
+        trigger = Trigger()
+
+        trigger.on_time = True
+        self.assertEqual(trigger.on_create, False)
+
+        trigger.on_create = True
+        self.assertEqual(trigger.on_time, False)