[REF] mass_mailing: make tests independent from demo data

Purpose of this commit is to avoid having tests depending on demo data.
Especially those tests are recent, introduced at 967d228a and should
have been made independent before merge. File is renamed according to
guidelines.

This commit is linked to task ID 1872198 and PR #26188.

addons/mass_mailing/tests/__init__.py

@@ -2,4 +2,4 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from . import test_mass_mailing_list_merge
-from . import test_mass_mailing_responsive
+from . import test_mass_mailing_content

addons/mass_mailing/tests/test_mass_mailing_responsive.py → addons/mass_mailing/tests/test_mass_mailing_content.py

@@ -7,13 +7,30 @@ from odoo.tests import common
 class TestResponsiveMail(common.SavepointCase):
 
     def test_responsive_mail(self):
-        """
-            Testing mail mailing responsive mail body
-        """
+        """ Testing mail mailing responsive mail body """
+        self.user_employee = self.env['res.users'].with_context({
+            'mail_create_nolog': True,
+            'mail_create_nosubscribe': True,
+            'mail_notrack': True,
+            'no_reset_password': True,
+        }).create({
+            'name': 'Geraldine Mass Mailing User',
+            'login': 'geraldine',
+            'email': 'g.g@example.com',
+            'groups_id': [(6, 0, [  
+                self.env.ref('mass_mailing.group_mass_mailing_user').id,
+                self.env.ref('base.group_partner_manager').id,  # TDE FIXME: check if really necessary for mass mailing
+            ])],
+        })
+
         test_record = self.env['res.partner'].create({'name': 'Mass Mail Partner'})
-        mass_mail_record = self.env.ref('mass_mailing.mass_mail_2')
+        mass_mail_record = self.env['mail.mass_mailing'].sudo(self.user_employee).create({
+            'name': 'Test',
+            'state': 'draft',
+            'mailing_model_id': self.env.ref('base.model_res_partner').id,
+        })
 
-        composer = self.env['mail.compose.message'].sudo().with_context({
+        composer = self.env['mail.compose.message'].sudo(self.user_employee).with_context({
             'default_composition_mode': 'mass_mail',
             'default_model': 'res.partner',
             'default_res_id': test_record.id,