Basic timed property for use with ScalaCheck.

gistfile1.sbt

import org.scalacheck.Prop
import org.scalacheck.Prop.Params
import java.util.concurrent.atomic.AtomicBoolean

class TimedProp(maximumMs: Int, wrappedProp: => Prop) extends Prop {
  def apply(prms: Params) = {
    val atLeastOnce = new AtomicBoolean(true)
    val startTime = System.currentTimeMillis()
    val resultStream = Stream.continually{
      Thread.sleep(20)
      wrappedProp.apply(prms)
    }
    resultStream.takeWhile(prop => (!prop.success && System.currentTimeMillis() < startTime + maximumMs) || atLeastOnce.getAndSet(false)).last
  }
}