gknauth gknauth - 6 months ago 55
Scala Question

How do I supply an implicit value for an akka.stream.Materializer when sending a FakeRequest?

I'm trying to make sense of the error(s) I'm seeing below, and to learn how to fix it.

could not find implicit value for parameter materializer: akka.Stream.Materializer
val fut: Future[Result] = action.apply(fakeRequest).run
not enough arguments for method run (implicit materializer: akka.stream.Materializer)scala.concurrent.Future[play.api.mvc.Result].
Unspecified value parameter materializer.
val fut: Future[Result] = action.apply(fakeRequest).run

Here is the test code that produced the error(s):

package com.foo.test

import com.foo.{Api, BoundingBox}
import org.scalatest.{FlatSpec, Matchers}
import play.api.libs.json._
import play.api.mvc._
import play.api.test.{FakeHeaders, FakeRequest}

import scala.concurrent.duration._
import scala.concurrent.{Await, Future}

class TestJmlPlay extends FlatSpec with Matchers {

val bbox = new BoundingBox(-76.778154438007732F, 39.239828198015971F, -76.501003519894326F, 39.354663763993926F)

"latitudes" should "be between swLat and neLat" in {
val action: Action[AnyContent] = (new Api).getForPlay(bbox)
val jsonStr = getStringFromAction(action)
areLatitudesOk(jsonStr, bbox) shouldBe true

private def getStringFromAction(action:Action[AnyContent]):String = {
val fakeRequest: Request[String] = new FakeRequest("fakeMethod", "fakeUrl", new FakeHeaders, "fakeBody")
val fut: Future[Result] = action.apply(fakeRequest).run // <== ERROR!
val result = Await.result(fut, 5000 milliseconds)

private def areLatitudesOk(jsonStr: String, bbox: BoundingBox): Boolean = ...


Answer Source

You can create an implicit ActorMaterializer within your test class which will use testkit's ActorSystem:

import akka.testkit.TestKit
import akka.actor.ActorSystem

class TestJmlPlay(_system : ActorSystem) extends TestKit(_system) ... {

  implicit val materializer = ActorMaterializer()

  val bbox = ...
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