[ADD] test_mail: add test case

- if filter apply for 'unread messages' or 'activity' with group by then result of read group should be total number of records not count of total number of unread messages or total number of activity

addons/test_mail/tests/test_mail_activity.py

@@ -65,3 +65,29 @@ def test_activity_flow_portal(self):
                     'res_id': test_record.id,
                 })
             # self.assertEqual(test_record.activity_ids, self.env['mail.activity'])
+
+    def test_activity_filter_with_read_group(self):
+        test_partner = self.env['res.partner'].with_context(self._quick_create_ctx).create({
+            'name': 'Test Partner',
+            'email': 'test@example.com',
+        })
+
+        self.env['mail.activity'].sudo().create({
+            'summary': 'Test Activity',
+            'date_deadline':  date.today() + relativedelta(days=2),
+            'activity_type_id': self.env.ref('mail.mail_activity_data_email').id,
+            'res_model_id': self.env['ir.model']._get(test_partner._name).id,
+            'res_id': test_partner.id,
+        })
+
+        self.env['mail.activity'].sudo().create({
+            'summary': 'Test Email Activity',
+            'date_deadline':  date.today() + relativedelta(days=2),
+            'activity_type_id': self.env.ref('mail.mail_activity_data_email').id,
+            'res_model_id': self.env['ir.model']._get(test_partner._name).id,
+            'res_id': test_partner.id,
+        })
+
+        # apply filter on res.partner for future activity and group by Sales Person
+        group = self.env['res.partner'].read_group([('activity_ids.date_deadline', '>', date.today())], ['user_id'], ['user_id'])
+        self.assertEqual(group[0]['user_id_count'], 1, 'Count should be 1 becasue only 1 record have 2 future activity')