Scala ordering DSL example

OrderingDSLExample.scala

object OrderingDSLExample extends App {
  case class My(num: Int, str: String)
  val myValues = List(My(3, "foo"), My(3, "bar"), My(5, "bar"), My(5, "foo"))

  import OrderingDSL._
  require(myValues.sortBy(m => (asc(m.num), asc(m.str))) ==
    List(My(3, "bar"), My(3, "foo"), My(5, "bar"), My(5, "foo")))

  require(myValues.sortBy(m => (asc(m.num), desc(m.str))) ==
    List(My(3, "foo"), My(3, "bar"), My(5, "foo"), My(5, "bar")))

  require(myValues.sortBy(m => (desc(m.num), asc(m.str))) ==
    List(My(5, "bar"), My(5, "foo"), My(3, "bar"), My(3, "foo")))

  require(myValues.sortBy(m => (desc(m.num), desc(m.str))) ==
    List(My(5, "foo"), My(5, "bar"), My(3, "foo"), My(3, "bar")))

  println("Horray!")
}