Add python test case

Hello,

Add a python test case in website_forum module.

More details:
Task link :- https://www.odoo.com/web#id=8745&view_type=form&model=project.task&menu_id=3942&action=327
Pad link :- https://pad.odoo.com/p/r.EsLOcZQQuvZYB4ll

Thanks,
ssh-odoo
I wouldn't use demo data here. If the user changes demo data, you may have tests that crash. I would create a new forum and questions / answers. This way you test that the access rights are correct, and you are demo-data independant.