Scala example source code file (AlignTest.scala)

This example Scala source code file (AlignTest.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

align, aligntest, list, none, option, some, speclite

The AlignTest.scala Scala example source code

package scalaz

import std.AllInstances._
import org.scalacheck.Prop.forAll

object AlignTest extends SpecLite {

  val F = Align[List]

  "pad" ! forAll{ (xs: List[Int], ys: List[Int]) =>
    val xys = F.pad(xs, ys)
    xys.foreach(_. mustMatch {case (None, None) => false; case _ => true})
    val max = xs.size max ys.size
    val min = xs.size min ys.size
    xys.length must_===(max)
    xys.takeWhile{case (x, y) => x.isDefined && y.isDefined}.size must_===(min)
    val dropped: List[(Option[Int], Option[Int])] = xys.dropWhile{case (x, y) => x.isDefined && y.isDefined}
    if(xs.size > ys.size)
      dropped.foreach(_ mustMatch {case (Some(_), None) => true})
    else
      dropped.foreach(_ mustMatch {case (None, Some(_)) => true})
  }

  "merge" ! forAll{ (xs: List[Int], ys: List[Int]) =>
    val xys = F.merge(xs, ys)
    xys.size must_===(xs.size max ys.size)
    xys must_===(xs.zipAll(ys, 0, 0).map{case (x, y) => x + y})
  }

  "alignA" ! forAll{ (xs: List[Int], ys: List[Int]) =>
    val xys = F.alignA(xs, ys)
    xys.size must_===(xs.size max ys.size)
    xys.takeWhile(_.isDefined).size must_===(xs.size)
    (xys.dropWhile(_.isDefined)).foreach(_ must_== None)
  }

  "alignB" ! forAll{ (xs: List[Int], ys: List[Int]) =>
    val xys = F.alignB(xs, ys)
    xys.size must_===(xs.size max ys.size)
    xys.takeWhile(_.isDefined).size must_===(ys.size)
    xys.dropWhile(_.isDefined).foreach(_ must_== None)
  }

  "alignThis" ! forAll{ (xs: List[Int], ys: List[Int]) =>
    val xys = F.alignThis(xs, ys)
    xys.size must_===(xs.size max ys.size)
    xys.dropWhile(_.isEmpty).size must_===((xs.size - ys.size) max 0)
    xys.dropWhile(_.isEmpty) foreach (_ mustMatch { case Some(_) => true })
  }

  "alignThat" ! forAll{ (xs: List[Int], ys: List[Int]) =>
    val xys = F.alignThat(xs, ys)
    xys.size must_===(xs.size max ys.size)
    xys.dropWhile(_.isEmpty).size must_===((ys.size - xs.size) max 0)
    xys.dropWhile(_.isEmpty) foreach (_ mustMatch { case Some(_) => true })
  }

  "alignBoth" ! forAll{ (xs: List[Int], ys: List[Int]) =>
    val xys = F.alignBoth(xs, ys)
    xys.size must_===(xs.size max ys.size)
    xys.takeWhile(_.isDefined).size must_===(xs.size min ys.size)
    xys.dropWhile(_.isDefined) foreach (_ must_== None)
  }

}