Scala example source code file (EitherTest.scala)

This example Scala source code file (EitherTest.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.

Learn more about this Scala project at its project page.

Java - Scala tags/keywords

either, eithertest, first, int, last, left, right, speclite

The EitherTest.scala Scala example source code

package scalaz
package std

import std.AllInstances._
import scalaz.scalacheck.ScalazProperties._
import scalaz.scalacheck.ScalazArbitrary._
import Tags._

object EitherTest extends SpecLite {
  checkAll("Either", order.laws[Either[Int, Int]])
  checkAll("Either.LeftProjection", order.laws[Either.LeftProjection[Int, Int]])
  checkAll("Either.LeftProjection @@ First", order.laws[Either.LeftProjection[Int, Int] @@ First])
  checkAll("Either.LeftProjection @@ Last", order.laws[Either.LeftProjection[Int, Int] @@ Last])
  checkAll("Either.RightProjection", order.laws[Either.RightProjection[Int, Int]])
  checkAll("Either.RightProjection @@ First", order.laws[Either.RightProjection[Int, Int] @@ First])
  checkAll("Either.RightProjection @@ Last", order.laws[Either.RightProjection[Int, Int] @@ Last])

  checkAll("Either.LeftProjection", monoid.laws[Either.LeftProjection[Int, Int]])
  checkAll("Either.LeftProjection @@ First", monoid.laws[Either.LeftProjection[Int, Int] @@ First])
  checkAll("Either.LeftProjection @@ Last", monoid.laws[Either.LeftProjection[Int, Int] @@ Last])
  checkAll("Either.RightProjection", monoid.laws[Either.RightProjection[Int, Int]])
  checkAll("Either.RightProjection @@ First", monoid.laws[Either.RightProjection[Int, Int] @@ First])
  checkAll("Either.RightProjection @@ Last", monoid.laws[Either.RightProjection[Int, Int] @@ Last])

  checkAll("Either.LeftProjection", monad.laws[Either.LeftProjection[?, Int]])
  checkAll("Either.RightProjection", monad.laws[Either.RightProjection[Int, ?]])
  checkAll("Either.LeftProjection @@ First", monad.laws[λ[α => Either.LeftProjection[α, Int] @@ First]])
  checkAll("Either.RightProjection @@ First", monad.laws[λ[α => Either.RightProjection[Int, α] @@ First]])
  checkAll("Either.LeftProjection @@ Last", monad.laws[λ[α => Either.LeftProjection[α, Int] @@ Last]])
  checkAll("Either.RightProjection @@ Last", monad.laws[λ[α => Either.RightProjection[Int, α] @@ Last]])

  checkAll("Either", bindRec.laws[Either[Int, ?]])
  checkAll("Either", monadError.laws[Either[Int, ?], Int])
  checkAll("Either", bifunctor.laws[Either])
  checkAll("Either", traverse.laws[Either[Int, ?]])
  checkAll("Either", bitraverse.laws[Either])
  checkAll("Either", associative.laws[Either])

  "show" in {
    import syntax.show._
    val left : Either[String, Int] = Left("leftside")
    val right : Either[String, Int] = Right(0)
    left.shows must_===("Left(\"leftside\")")
    right.shows must_===("Right(0)")
  }
}