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Scala example source code file (OrderTest.scala)

This example Scala source code file (OrderTest.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

foldable1, nonemptylist, option, ordertest, speclite, tag

The OrderTest.scala Scala example source code

package scalaz

import std.AllInstances._
import Dual._
import scalaz.scalacheck.ScalazArbitrary._
import org.scalacheck.Prop.forAll

object OrderTest extends SpecLite {
  "duals" ! forAll {
    (xs: List[Int]) =>
      val F = Foldable[List]
      val xsdual: List[Int @@ Tags.Dual] = Tag subst xs
      (F maximum xs: Option[Int]) must_===(Tag unsubst (F minimum xsdual: Option[Int @@ Tags.Dual]))
      (F minimum xs: Option[Int]) must_===(Tag unsubst (F maximum xsdual: Option[Int @@ Tags.Dual]))
  }

  "semigroups min" ! forAll {
    (xs: NonEmptyList[Int]) =>
      val F = Foldable1[NonEmptyList]
      import Tags._
      import syntax.foldable1._
      Tag unwrap (MinVal.subst(xs).suml1) must_===(F minimum1 xs)
  }

  "semigroups max" ! forAll {
    (xs: NonEmptyList[Int]) =>
      val F = Foldable1[NonEmptyList]
      import Tags._
      import syntax.foldable1._
      Tag unwrap (MaxVal.subst(xs).suml1) must_===(F maximum1 xs)
  }
}

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