'Verify that nothing happens when the `commit` flag is not given.'

def test_without_commit(self):

    self._enroll_users(self.course, self.users, 'audit')
    CourseModeFactory(course_id=self.course.id, mode_slug='honor')
    call_command('bulk_change_enrollment', course=unicode(self.course.id), from_mode='audit', to_mode='honor')
    self.assertEqual(len(CourseEnrollment.objects.filter(mode='honor', course_id=self.course.id)), 0)
