add samples for async testing

Author: rkuhn

CLA.md

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+# Contributor’s License Agreement
+
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+
+*Note:* the conditions detailed below are copied verbatim from the [Individual Contributor’s License Agreement version 2 of the Apache Foundation](http://www.apache.org/licenses/icla.txt) with the addition of the last sentence in paragraph 2.
+
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CONTRIBUTING.md

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+To get started, <a href="https://www.clahub.com/agreements/ReactiveDesignPatterns/CodeSamples">sign the Contributor License Agreement</a>.

LICENSE

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+This software is licensed under the Apache 2 license, quoted below.
+
+Copyright 2009-2014 Typesafe Inc. [http://www.typesafe.com]
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not
+use this file except in compliance with the License. You may obtain a copy of
+the License at
+
+    [http://www.apache.org/licenses/LICENSE-2.0]
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+License for the specific language governing permissions and limitations under
+the License.
+
+---------------
+
+Licenses for dependency projects can be found here:
+[http://akka.io/docs/akka/snapshot/project/licenses.html]

README.md

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+# Reactive Design Patterns Code Samples
+
+This repository hosts the code samples that are used in [Reactive Design Patterns](http://manning.com/kuhn) for illustration. We aim at full test coverage to make sure that the code that we present actually works. While we tend to start out with writing Scala or Java code, we want this repository to also hold samples in other languages (like JavaScript, Ruby, Python, etc.). Contributions, corrections, wishes and all kind of help is appreciated, please don’t hesitate to use the issue tracker.
+
+## Legal
+
+The code in this repository is offered royalty-free under the Apache License version 2, see the LICENSE file in the root directory. 
+

build.sbt

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+organization in ThisBuild := "com.reactivedesignpatterns"
+
+scalaVersion in ThisBuild := "2.11.2"
+
+lazy val common = project in file("common")
+
+lazy val chapter04 = project dependsOn (common)
+
+lazy val chapter07 = project dependsOn (common)
+

chapter04/build.sbt

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+libraryDependencies ++= Seq(
+  "com.typesafe.akka" %% "akka-testkit" % "2.3.6" % "test",
+  "junit" % "junit" % "4.11" % "test",
+  "org.scalatest" %% "scalatest" % "2.2.2" % "test"
+)

chapter04/src/main/scala/com/reactivedesignpatterns/chapter4/EchoService.scala

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+package com.reactivedesignpatterns.chapter4
+
+import akka.actor.Actor
+import akka.actor.ActorRef
+
+object EchoService {
+  case class Request(tag: String, client: ActorRef)
+  case class Response(tag: String)
+}
+
+class EchoService extends Actor {
+  import EchoService._
+
+  def receive = {
+    case Request(tag, ref) => ref ! Response(tag)
+  }
+}

chapter04/src/main/scala/com/reactivedesignpatterns/chapter4/TranslationService.scala

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+package com.reactivedesignpatterns.chapter4
+
+import scala.concurrent.ExecutionContext
+import scala.concurrent.Future
+
+class TranslationService {
+  import ExecutionContext.Implicits.global
+  
+  def translate(input: String): Future[String] = Future { Thread.sleep(100); "How are you?" }
+  
+  def translate(input: String, ec: ExecutionContext): Future[String] =
+    Future { Thread.sleep(100); "How are you?" }(ec)
+}