Scala example source code file (EndoTest.scala)

This example Scala source code file (EndoTest.scala) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Scala by Example" ^TM.

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Java - Scala tags/keywords

arbitrary, endotest, equal, speclite

The EndoTest.scala Scala example source code

package scalaz

import scalaz.scalacheck.ScalazProperties._
import scalaz.scalacheck.ScalaCheckBinding._
import org.scalacheck.Arbitrary

object EndoTest extends SpecLite {

  implicit def endoArb[A](implicit A: Arbitrary[A => A]): Arbitrary[Endo[A]] =
    Functor[Arbitrary].map(A)(Endo.endo)

  implicit val endoIntEqual: Equal[Endo[Int]] =
    Equal.equal( (a, b) =>
      Iterator.fill(20)(util.Random.nextInt).forall(n => a(n) == b(n))
    )

  checkAll(invariantFunctor.laws[Endo])

}