def METHOD_NAME(self):
    coupon = Coupon.objects.create(
        id="coupon-test-percent-off-3month",
        percent_off=10.25,
        currency="usd",
        duration="repeating",
        duration_in_months=3,
    )
    self.assertEqual(coupon.human_readable, "10.25% off for 3 months")
    self.assertEqual(str(coupon), coupon.human_readable)