Running Scala Spec getting Error ..could not find implicit value for parameter ta

Question

I have someTrait that extends Actor ( becuase it using some actor ref inside)

trait DemoService extends Actor {

  def actorRefFactory = context
  implicit def executionContext = actorRefFactory.dispatcher

  val demoRoute = {
    get {
      pathSingleSlash {
        complete(index)
      } ~
      path("ping") {
        complete("PONG!")
      }

Now I am Writing Spec file for same.

TestServiceSpec extends FlatSpec with Spec2RouteTest with DemoService 

gettting error

could not find implicit value for parameter ta: TestServiceSpec 
.this.TildeArrow[spray.routing.RequestContext,Unit]"

If I use ScalaTestRouteTest also I get this error.