diff --git a/addons/project/tests/test_project_sharing_portal_access.py b/addons/project/tests/test_project_sharing_portal_access.py
index e3cf97fc01709..cc8ca865ce515 100644
--- a/addons/project/tests/test_project_sharing_portal_access.py
+++ b/addons/project/tests/test_project_sharing_portal_access.py
@@ -24,7 +24,7 @@ def setUpClass(cls):
                 Command.link(cls.partner_portal.id),
             ],
         })
-        project_share_wizard.action_send_mail()
+        project_share_wizard.action_share_record()
 
         Task = cls.env['project.task']
         cls.read_protected_fields_task = OrderedDict([
@@ -76,3 +76,31 @@ def test_write_with_portal_user(self):
         for field in self.other_fields_task:
             with self.assertRaises(AccessError):
                 self.task_portal.with_user(self.user_portal).write({field: 'dummy'})
+
+    def test_wizard_confirm(self):
+        partner_portal_no_user = self.env['res.partner'].create({
+            'name': 'NoUser portal',
+            'email': 'no@user.portal',
+            'company_id': False,
+            'user_ids': [],
+        })
+
+        project_share_wizard_no_user = self.env['project.share.wizard'].create({
+            'access_mode': 'edit',
+            'res_model': 'project.project',
+            'res_id': self.project_portal.id,
+            'partner_ids': [
+                Command.link(partner_portal_no_user.id),
+            ],
+        })
+        self.env["res.config.settings"].create({"auth_signup_uninvited": 'b2b'}).execute()
+
+        project_share_wizard_no_user_action = project_share_wizard_no_user.action_share_record()
+        self.assertEqual(project_share_wizard_no_user_action['type'], 'ir.actions.act_window', 'Sharing a project with partner without user should display a confimation dialog')
+        project_share_wizard_confirmation = self.env['project.share.wizard'].browse(project_share_wizard_no_user_action['res_id'])
+
+        project_share_wizard_confirmation.action_send_mail()
+        mail_partner = self.env['mail.message'].search([('partner_ids', '=', partner_portal_no_user.id)], limit=1)
+        self.assertTrue(mail_partner, 'A mail should have been sent to the non portal user')
+        self.assertIn('href="http://localhost:8069/web/signup', str(mail_partner.body), 'The message link should contain the url to register to the portal')
+        self.assertIn('token=', str(mail_partner.body), 'The message link should contain a personalized token to register to the portal')
diff --git a/addons/project/tests/test_project_subtasks.py b/addons/project/tests/test_project_subtasks.py
index 8753808a40c4b..b7dd7e8b8e060 100644
--- a/addons/project/tests/test_project_subtasks.py
+++ b/addons/project/tests/test_project_subtasks.py
@@ -307,3 +307,15 @@ def test_subtask_copy_display_in_project(self):
         self.assertEqual(len(project_copy.task_ids.child_ids), 4)
         subtask_not_display_in_project_copy = project_copy.task_ids.child_ids.filtered(lambda t: not t.display_in_project)
         self.assertEqual(len(subtask_not_display_in_project_copy), 4, "No subtask should be displayed in the duplicate project")
+
+    def test_subtask_unlinking(self):
+        task_form = Form(self.task_1.with_context({'tracking_disable': True}))
+        with task_form.child_ids.new() as child_task_form:
+            child_task_form.name = 'Test Subtask 1'
+            child_task_form.project_id = task_form.project_id
+        task_form.save()
+        child_subtask = self.task_1.child_ids[0]
+        self.task_1.unlink()
+
+        self.assertFalse(self.task_1.exists())
+        self.assertFalse(child_subtask.exists(), 'Subtask should be removed if the parent task has been deleted')