1. Login as a teacher and create a forum with 'Subscription Mode' set to 'Optional subscription'.
2. Login as a student and check that you can choose to subscribe/unsubscribe.

3. Login as a teacher and create a forum with 'Subscription Mode' set to 'Forced Subscription'.
4. Login as a student and check that you are subscribed with no option to unsubscribe.

5. Login as a teacher and create a forum with 'Subscription Mode' set to 'Auto subscription'.
6. Login as a student and check that you are not subscribed initially. Post a message. Check that you are now subscribed and that you have the option to unsubscribe.

7. Login as a teacher and create a forum with 'Subscription Mode' set to 'Subscription disabled'.
8. Login as a student and check that you have no option to subscribe.