[IMP] project_todo: write test for the create_todo_activity command

We check that both an activity and a task has been created by the create_todo_activity call
We check that the task has the same description as the activity.todo.create note

We check that the activity and the task have the same:
- name
- user
- deadline

Task-3492155

closes odoo/odoo#135134

Signed-off-by: Xavier Bol (xbo) <xbo@odoo.com>

addons/project_todo/tests/__init__.py

@@ -1,3 +1,4 @@
 # -*- coding: utf-8 -*-
 
 from . import test_access_rights
+from . import test_mail_activity_todo_create

addons/project_todo/tests/test_mail_activity_todo_create.py

@@ -0,0 +1,29 @@
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+import datetime
+from markupsafe import Markup
+from odoo.tests.common import TransactionCase
+
+
+class TestMailActivityTodo(TransactionCase):
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        cls.mail_activity = cls.env['mail.activity.todo.create'].create({
+            'summary': 'test_summary',
+            'date_deadline': datetime.date.today(),
+            'note': Markup('<p>details</p>'),
+            'user_id': cls.env.ref('base.user_admin').id,
+        })
+        cls.mail_activity.create_todo_activity()
+
+    def test_create_todo_activity(self):
+        todo_1 = self.env['project.task'].search([('name', 'ilike', 'test_summary')], limit=1)
+        activity_1 = self.env['mail.activity'].search([('summary', 'ilike', 'test_summary')], limit=1)
+        self.assertTrue(todo_1.exists(), 'A Todo should have been created')
+        self.assertEqual(todo_1.description, Markup('<p>details</p>'), 'The Todo description should be the same as the mail.activity.todo.create note')
+        self.assertTrue(activity_1.exists(), 'An Activity should have been created')
+        self.assertEqual(activity_1.summary, todo_1.name, 'The Todo and The Activity should have the same name/summary')
+        self.assertEqual(activity_1.user_id, todo_1.user_ids, 'The Todo and The Activity should have the same user')
+        self.assertEqual(activity_1.date_deadline, todo_1.date_deadline, 'The Todo and The Activity should have the same date deadline')