Add test call to on_change methods

- Manage None as value of field in on_change method

issue6069
review27851002

trytond/ir/note.py

@@ -37,7 +37,8 @@ class Note(ResourceMixin, ModelSQL, ModelView):
     @fields.depends('message')
     def on_change_with_message_wrapped(self, name=None):
         wrapper = self.get_wrapper()
-        return '\n'.join(map(wrapper.fill, self.message.splitlines()))
+        message = self.message or ''
+        return '\n'.join(map(wrapper.fill, message.splitlines()))
 
     @classmethod
     def get_unread(cls, ids, name):

trytond/tests/test_tryton.py

@@ -305,6 +305,12 @@ class ModuleTestCase(unittest.TestCase):
                     elif attr.startswith('order_'):
                         tables = {None: (model.__table__(), None)}
                         getattr(model, attr)(tables)
+                    elif any(attr.startswith(p) for p in [
+                                'on_change_',
+                                'on_change_with_',
+                                'autocomplete_']):
+                        record = model()
+                        getattr(record, attr)()
 
     @with_transaction()
     def test_menu_action(self):