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introduction

ScalaCheck 1.14.0 was just released with support for deterministic testing using seeds. Some folks have asked for examples, so I wanted to produce a Gist to help people use this feature.

simple example

These examples will assume the following imports:

debasishg

scala> import frdomain.ch8.cqrs.service._
import frdomain.ch8.cqrs.service._

scala> import Scripts._
import Scripts._

scala> import RepositoryBackedAccountInterpreter._
import RepositoryBackedAccountInterpreter._

scala> RepositoryBackedAccountInterpreter(composite)

channingwalton

package set.performance

import java.util.concurrent.TimeUnit

import scala.concurrent.duration.FiniteDuration

/**
* On my machine the fast method takes < 2 ms, the slow one 2.2s
*/
object SetPerformance {

milessabin

miles@frege:~$ ./shapeless.sh 
Loading...
Welcome to the Ammonite Repl 0.5.2
(Scala 2.11.7 Java 1.8.0_51)
@ val l = 23 :: "foo" :: true :: HNil
l: Int :: String :: Boolean :: HNil = ::(23, ::("foo", ::(true, HNil)))
@

viktorklang

import scala.concurrent._
import scala.collection.mutable.Builder
import scala.collection.generic.CanBuildFrom
import language.higherKinds

/**
 * Linearize asynchrnously applies a given function in-order to a sequence of values, producing a Future with the result of the function applications.
 * Execution of subsequent entries will be aborted if an exception is thrown in the application of the function.
 */
def linearize[T, U, C[T] <: Traversable[T]](s: C[T])(f: T => U)(implicit cbf: CanBuildFrom[C[T], U, C[U]], e: ExecutionContext): Future[C[U]] = {