我正在尝试理解下面看到的错误,并学习如何修复它。
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:
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 = ...
}
最佳答案
您可以在测试类中创建一个隐式ActorMaterializer
,它将使用testkit的ActorSystem
:
import akka.testkit.TestKit
import akka.actor.ActorSystem
class TestJmlPlay(_system : ActorSystem) extends TestKit(_system) ... {
implicit val materializer: ActorMaterializer = ActorMaterializer()
val bbox = ...
关于scala - 发送 FakeRequest 时如何为 akka.stream.Materializer 提供隐式值?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36945414/