alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Scala example source code file (TheseTest.scala)

This example Scala source code file (TheseTest.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

apply, ephemeralstream, equal, functor, int, list, none, order, semigroup, show, string, thesetest

The TheseTest.scala Scala example source code

package scalaz

import scalaz.scalacheck.ScalazProperties._
import scalaz.scalacheck.ScalazArbitrary._
import std.AllInstances._
import \&/._
import syntax.contravariant._
import org.scalacheck.Prop.forAll

object TheseTest extends SpecLite {
  type TheseInt[a] = Int \&/ a

  checkAll(bindRec.laws[TheseInt])
  checkAll(monad.laws[TheseInt])
  checkAll(cobind.laws[TheseInt])
  checkAll(traverse.laws[TheseInt])
  checkAll(order.laws[Int \&/ Int])
  checkAll(semigroup.laws[Int \&/ Int])
  checkAll(bitraverse.laws[\&/])

  implicit def ephemeralStreamShow[A: Show]: Show[EphemeralStream[A]] =
    Show[List[A]].contramap(_.toList)

  "align unalign" should {
    "List" ! forAll { (a: List[Int], b: List[Int]) =>
      unalignList(Align[List].align(a, b)) must_=== ((a, b))
    }
    "EphemeralStream" ! forAll { (a: EphemeralStream[Int], b: EphemeralStream[Int]) =>
      unalignStream(Align[EphemeralStream].align(a, b)) must_=== ((a, b))
    }
  }

  "onlyThisOrThat" should {
    "be invertible" ! forAll { ab: Int \/ String =>
      ab.toThese.onlyThisOrThat must_=== Some(ab)
    }
    "handle both" ! forAll { (a: Int, b: String) =>
      \&/.Both(a,b).onlyThisOrThat must_=== None
    }
  }

  object instances {
    def equal[A: Equal, B: Equal] = Equal[A \&/ B]
    def order[A: Order, B: Order] = Order[A \&/ B]
    def functor[L] = Functor[L \&/ ?]
    def apply[L: Semigroup] = Apply[L \&/ ?]
    def applicative[L: Semigroup] = Applicative[L \&/ ?]
    def bindRec[L: Semigroup] = BindRec[L \&/ ?]
    def monad[L: Semigroup] = Monad[L \&/ ?]
    def semigroup[L: Semigroup, R: Semigroup] = Semigroup[L \&/ R]
    def cobind[L] = Cobind[L \&/ ?]
    def foldable[L] = Foldable[L \&/ ?]
    def traverse[L] = Traverse[L \&/ ?]
    def bifunctor = Bifunctor[\&/]
    def bifoldable = Bifoldable[\&/]
    def bitraverse = Bitraverse[\&/]

    // checking absence of ambiguity
    def functor[L: Semigroup] = Functor[L \&/ ?]
    def equal[A: Order, B: Order] = Equal[A \&/ B]
  }
}

Other Scala examples (source code examples)

Here is a short list of links related to this Scala TheseTest.scala source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.