Scala example source code file (MVarTest.scala)

This example Scala source code file (MVarTest.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

mvartest, speclite, strategy

The MVarTest.scala Scala example source code

package scalaz
package concurrent


import scalaz.concurrent.MVar.newEmptyMVar
import scalaz.effect.IO

object MVarTest extends SpecLite {

  def forkIO(f: => IO[Unit])(implicit s: Strategy): IO[Unit] =
    IO { s(f.unsafePerformIO); () }

  /** NOTE: This test replicates #314 approx 1 in every 2 attempts. */
  "MVar" should {
    "have deterministic sequential take/put behaviour" in {
      def run = for {
        in <- newEmptyMVar[String]
        _ <- forkIO {
          for {
            _ <- in.put("one")
            _ <- in.put("two")
          } yield ()
        }
        a <- in.take
        b <- in.take
      } yield (a, b)

      run.unsafePerformIO must_== ("one", "two")
    }
  }
}