diff --git a/odoo/addons/base/tests/common.py b/odoo/addons/base/tests/common.py
index 28ddff19b06..c4b8e412e23 100644
--- a/odoo/addons/base/tests/common.py
+++ b/odoo/addons/base/tests/common.py
@@ -10,25 +10,26 @@ from odoo import Command
 
 class TransactionCaseWithUserDemo(TransactionCase):
 
-    def setUp(self):
-        super(TransactionCaseWithUserDemo, self).setUp()
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
 
-        self.env.ref('base.partner_admin').write({'name': 'Mitchell Admin'})
-        self.user_demo = self.env['res.users'].search([('login', '=', 'demo')])
-        self.partner_demo = self.user_demo.partner_id
+        cls.env.ref('base.partner_admin').write({'name': 'Mitchell Admin'})
+        cls.user_demo = cls.env['res.users'].search([('login', '=', 'demo')])
+        cls.partner_demo = cls.user_demo.partner_id
 
-        if not self.user_demo:
-            self.env['ir.config_parameter'].sudo().set_param('auth_password_policy.minlength', 4)
+        if not cls.user_demo:
+            cls.env['ir.config_parameter'].sudo().set_param('auth_password_policy.minlength', 4)
             # YTI TODO: This could be factorized between the different classes
-            self.partner_demo = self.env['res.partner'].create({
+            cls.partner_demo = cls.env['res.partner'].create({
                 'name': 'Marc Demo',
                 'email': 'mark.brown23@example.com',
             })
-            self.user_demo = self.env['res.users'].create({
+            cls.user_demo = cls.env['res.users'].create({
                 'login': 'demo',
                 'password': 'demo',
-                'partner_id': self.partner_demo.id,
-                'groups_id': [Command.set([self.env.ref('base.group_user').id, self.env.ref('base.group_partner_manager').id])],
+                'partner_id': cls.partner_demo.id,
+                'groups_id': [Command.set([cls.env.ref('base.group_user').id, cls.env.ref('base.group_partner_manager').id])],
             })