scala 发送 FakeRequest 时如何为 akka.stream.Materializer 提供隐式值？
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How do I supply an implicit value for an akka.stream.Materializer when sending a FakeRequest?
提问by gknauth
I'm trying to make sense of the error(s) I'm seeing below, and to learn how to fix it.
我试图理解我在下面看到的错误，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
^
Here is the test code that produced the error(s):
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 = ...
}
回答by Ramón J Romero y Vigil
You can create an implicit ActorMaterializerwithin your test class which will use testkit's ActorSystem:
您可以ActorMaterializer在将使用 testkit 的测试类中创建一个隐式ActorSystem：
import akka.testkit.TestKit
import akka.actor.ActorSystem
class TestJmlPlay(_system : ActorSystem) extends TestKit(_system) ... {
implicit val materializer: ActorMaterializer = ActorMaterializer()
val bbox = ...
回答by Bartosz Pioruński
You don't need Materializer.
你不需要物化器。
I believe you are calling not the right action.applymethod.
You want def apply(request: Request[A]): Future[Result]
To call the right, you need FakeRequest[AnyContent], same parametrized type as action:Action[AnyContent].This type is forced by PlayBodyParser I believe you set for your action.
我相信你调用的action.apply方法不正确。
你想要def apply(request: Request[A]): Future[Result]
调用正确的，你需要FakeRequest[AnyContent]，与 相同的参数化类型action:Action[AnyContent]。这种类型是由 PlayBodyParser 强制的，我相信你为你的动作设置的。
After that you don't need .runcall
之后你不需要.run打电话
