message: Add missing test for expired coupon code
diff: @@ -70,6 +70,10 @@ describe('insecurity', () => {
  expect(insecurity.discountFromCoupon(z85.encode('DEC2018-10'))).to.equal(undefined)
  })
  + it('returns undefined for expired coupon code', () => {
  + expect(insecurity.discountFromCoupon(z85.encode('SEP14-50'))).to.equal(undefined)
  + })
  +
  it('returns discount from valid coupon code', () => {
  expect(insecurity.discountFromCoupon(insecurity.generateCoupon('05'))).to.equal(5)
  expect(insecurity.discountFromCoupon(insecurity.generateCoupon(10))).to.equal(10)
  