akka-http with Yaml Marshalling / Unmarshalling

sbt-output.txt

 SBT > projectX > test
[info] Compiling 1 Scala source to /Users/rbuckland/projects/projectX/target/scala-2.11/test-classes...
[error] /Users/rbuckland/projects/projectX/src/test/scala/sample/WidgetMarshalTest.scala:25: could not find implicit value for parameter m: akka.http.scaladsl.marshalling.Marshaller[sample.Widget,akka.http.scaladsl.model.RequestEntity]
[error]     val entity = Marshal(w).to[RequestEntity].futureValue
[error]                               ^
[error] one error found
[error] (projectX/test:compileIncremental) Compilation failed
[error] Total time: 2 s, completed 12-Jan-2016 14:01:56

WidgetMarshalTest.scala

package sample

import akka.http.scaladsl.marshalling._
import akka.http.scaladsl.unmarshalling._
import akka.http.scaladsl.model.RequestEntity
import org.scalatest._
import net.jcazevedo.moultingyaml._

case class Widget(name:String,color:String)

trait WidgetUnMProtocols extends DefaultYamlProtocol {

  implicit val widgetFormat = yamlFormat2(Widget)
  implicit def unmar = Unmarshaller.strict[String,Widget] { _.parseYaml.convertTo[Widget] }
  implicit def mar = Marshaller.opaque[Widget, String] { _.toYaml.prettyPrint }

}


class WidgetSpec extends FlatSpec with Matchers with WidgetUnMProtocols {

  "marshalling" should "work" in {

    val w = Widget("thingy","yellow")
    val entity = Marshal(w).to[RequestEntity].futureValue
    Unmarshal(entity).to[Widget].futureValue shouldBe w
  }
}