'Assert that enrollment is refundable if course mode has expired.'

@patch('student.models.CourseEnrollment.refund_cutoff_date')
def test_refundable_expired_verification(self, cutoff_date):

    cutoff_date.return_value = (datetime.now(pytz.UTC) + timedelta(days=1))
    self.verified_mode.expiration_datetime = (datetime.now(pytz.UTC) - timedelta(days=1))
    self.verified_mode.save()
    self.assertTrue(self.enrollment.refundable())
