发送 FakeRequest 时如何为 akka.stream.Materializer 提供隐式值?

问题描述

我正在尝试理解我在下面看到的错误，并学习如何修复它.

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
                                  ^

这是产生错误的测试代码:

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)
    result.body.toString
  }

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

}

推荐答案

你可以在你的测试类中创建一个隐式的 ActorMaterializer，它将使用 testkit 的 ActorSystem:

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 = ActorMaterializer()

  val bbox = ...

这篇关于发送 FakeRequest 时如何为 akka.stream.Materializer 提供隐式值?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！