Add two forums to your Moodle: one without groups and the other one with groups. In the app, check that you can see the "Add new discussion button" only if you have permissions to add new discussions and your Moodle site have the WS to do so. Check that you can select the group you want to post to in the forum with groups enabled. Check that you can't see the groups option in the other forum. Check that you can add a new discussion to a forum. Check that the discussions list is updated after you do so (check it both in phone and tablet). Inside a discussion, check that you can see a Reply button only if you have permissions to reply a post and Moodle site have the WS to do so. Check that you can only reply to one post at once. Also, check that switching the post you're replying to doesn't lose the written data. Check that if you try to cancel a post with something written in it, a confirmation modal is shown. Check that this modal is not shown if subject and message are empty. Check that you can add a new post and that the posts list is updated after adding a new post.