[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>

3 files changed, 6 insertions, 28 deletions

diff --git a/addons/base_automation/models/__init__.py b/addons/base_automation/models/__init__.py
index edef98c31b6..dd3d1a0ad3c 100644
--- a/addons/base_automation/models/__init__.py
+++ b/addons/base_automation/models/__init__.py
@@ -3,4 +3,3 @@
 
 from . import base_automation
 from . import ir_actions
-from . import ir_demo
diff --git a/addons/base_automation/models/base_automation.py b/addons/base_automation/models/base_automation.py
index 37a6998b670..52b753481cb 100644
--- a/addons/base_automation/models/base_automation.py
+++ b/addons/base_automation/models/base_automation.py
@@ -94,13 +94,14 @@ class BaseAutomation(models.Model):
                 }
             }}
 
-    @api.model
-    def create(self, vals):
-        vals['usage'] = 'base_automation'
-        base_automation = super(BaseAutomation, self).create(vals)
+    @api.model_create_multi
+    def create(self, vals_list):
+        for vals in vals_list:
+            vals['usage'] = 'base_automation'
+        base_automations = super(BaseAutomation, self).create(vals_list)
         self._update_cron()
         self._update_registry()
-        return base_automation
+        return base_automations
 
     def write(self, vals):
         res = super(BaseAutomation, self).write(vals)
diff --git a/addons/base_automation/models/ir_demo.py b/addons/base_automation/models/ir_demo.py
deleted file mode 100644
index e951c04ba33..00000000000
--- a/addons/base_automation/models/ir_demo.py
+++ /dev/null
@@ -1,22 +0,0 @@
-# -*- coding: utf-8 -*-
-# Part of Odoo. See LICENSE file for full copyright and licensing details.
-
-from odoo import models
-
-
-class IrDemo(models.TransientModel):
-    _inherit = 'ir.demo'
-
-    def install_demo(self):
-        # Prevent the registry to reload while loading demo data, since `create` calls
-        # `_update_registry`.
-        self.pool.ready = False
-        try:
-            result = super().install_demo()
-        finally:
-            self.pool.ready = True
-
-        # Reload the registry
-        self.env['base.automation']._update_registry()
-
-        return result