[MERGE] various: Make the test suite demo data independant

Purpose
=======

This is the first huge step to improve the test suite in several ways:

- Make them demo data independent, allowing to modify the demo data without having to adapt the tests depending on it. It also allows to have a beautiful + convenient demo dataset to make a demonstration, and to configure complex data in the tests to manage the corner cases.
- Improve the test performances by converting them into SavepointCase. Each test will be rollbacked to it's initial state, after the setUpClass call. That way the different data are not re-created at each test for nothing.
- Introduce several test classes in base/tests/common.py to launch a TransactionCase, HttpCase or SavepointCase test with an available demo user, portal user or a large set of partners.
- This is the first step to tend to a rolling release process, allowing to execute the tests (or a subset of the tests) on a migrated base, for example.

closes odoo/odoo#39868

Taskid: 2075739
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/addons/test_mail/tests/test_ir_actions.py b/addons/test_mail/tests/test_ir_actions.py
index 9a20ee94db3..52a65232985 100644
--- a/addons/test_mail/tests/test_ir_actions.py
+++ b/addons/test_mail/tests/test_ir_actions.py
@@ -19,13 +19,14 @@ class TestServerActionsEmail(BaseFunctionalTest, TestServerActionsBase):
 
     def test_action_followers(self):
         self.test_partner.message_unsubscribe(self.test_partner.message_partner_ids.ids)
+        random_partner = self.env['res.partner'].create({'name': 'Thierry Wololo'})
         self.action.write({
             'state': 'followers',
-            'partner_ids': [(4, self.env.ref('base.partner_admin').id), (4, self.env.ref('base.partner_demo').id)],
+            'partner_ids': [(4, self.env.ref('base.partner_admin').id), (4, random_partner.id)],
             'channel_ids': [(4, self.env.ref('mail.channel_all_employees').id)]
         })
         self.action.with_context(self.context).run()
-        self.assertEqual(self.test_partner.message_partner_ids, self.env.ref('base.partner_admin') | self.env.ref('base.partner_demo'))
+        self.assertEqual(self.test_partner.message_partner_ids, self.env.ref('base.partner_admin') | random_partner)
         self.assertEqual(self.test_partner.message_channel_ids, self.env.ref('mail.channel_all_employees'))
 
     def test_action_next_activity(self):