[IMP] test_new_api: add list view for participants in discussion form view

This is for testing the result of an `onchange` that returns a many2many field.

openerp/addons/test_new_api/tests/test_onchange.py

@@ -133,7 +133,10 @@ class TestOnChange(common.TransactionCase):
 
         field_onchange = self.Discussion._onchange_spec()
         self.assertEqual(field_onchange.get('moderator'), '1')
-        self.assertFalse(any(name.startswith('participants.') for name in field_onchange))
+        self.assertItemsEqual(
+            strip_prefix('participants.', field_onchange),
+            ['display_name'],
+        )
 
         # first remove demo user from participants
         discussion.participants -= demo
@@ -151,9 +154,10 @@ class TestOnChange(common.TransactionCase):
         result = discussion.onchange(values, 'moderator', field_onchange)
 
         self.assertIn('participants', result['value'])
-        self.assertEqual(
+        self.assertItemsEqual(
             result['value']['participants'],
-            [(5,)] + [(4, usr.id) for usr in discussion.participants + demo],
+            [(5,)] + [(1, user.id, {'display_name': user.display_name})
+                      for user in discussion.participants + demo],
         )
 
     def test_onchange_one2many_value(self):

openerp/addons/test_new_api/views.xml

@@ -49,7 +49,7 @@
                         <notebook>
                             <page string="Messages">
                                 <field name="messages">
-                                    <tree name="Messages">
+                                    <tree string="Messages">
                                         <field name="name"/>
                                         <field name="body"/>
                                     </tree>
@@ -65,7 +65,11 @@
                                 </field>
                             </page>
                             <page string="Participants">
-                                <field name="participants"/>
+                                <field name="participants">
+                                    <tree string="Participants">
+                                        <field name="display_name"/>
+                                    </tree>
+                                </field>
                             </page>
                         </notebook>
                         <group>