PosMonoidLawsForFastMoney.scala

val (x, y, z) = (1.eur, 2.eur, 3.eur)

test("associativity") {
  assert(((x |+| y) |+| z) == (x |+| (y |+| z)))
}

test("left identity") {
  assert((Monoid.empty |+| x) == x)
}

test("right identity") {
  assert((x |+| Monoid.empty) == x)
}

implicit class IntToFastMoneyConversions(amount: Int) {
  val eur: FastMoney = FastMoney.of(amount, "EUR")
}