Create a course C1. Enrol students s1, s2, s3 and s4 to C1. Create a group g1 in C1 with s2 and s3 as members. Create an assignment with a due date. Create user overrides for the assignment's due date for s1 and s2. Create a group override for the assignment's due date for g1. Login as s1 and go to the calendar. Confirm that the calendar only displays the user override event for the assignment for s1. Login as s2 and go to the calendar. Confirm that the calendar only displays the user override event for the assignment for s2. Login as s3 and go to the calendar. Confirm that the calendar only displays the group override event for the assignment for g1. Login as s4 and go to the calendar. Confirm that the calendar only displays the assignment's original due date. Bonus: Repeat the above tests, but for lesson and quiz activities.