public void instructorLogoff()
{
instructor instructor = new instructor(id);
teachingStaffMenu instructorMenu = new teachingStaffMenu(instructor);
instructorMenu.Close();
Assert.IsNotNull(instructorMenu);
}
public void professorLogoff()
{
professor professor = new professor(id);
teachingStaffMenu professorMenu = new teachingStaffMenu(professor);
professorMenu.Close();
Assert.IsNotNull(professorMenu);
}