'Verify expiration not updated by signal for non-verified mode.'

def test_no_verified_mode(self):

    (course_mode, __) = self.create_mode('honor', 'honor')
    _listen_for_course_publish('store', self.course.id)
    course_mode.refresh_from_db()
    self.assertIsNone(course_mode.expiration_datetime)
