我如何测试使用WsClient本身发出请求的Play应用？

Question

我有一个Play 2.7.x应用程序，应该将请求转发到其他URL。它有一个实现如下的控制器：

import play.api.mvc._
import play.api.libs.ws.WSClient

class MyController(val controllerComponents: ControllerComponents, ws: WSClient, baseUrl: String) extends BaseController {
  // POST /foo routed here
  def foo() = {
    Action.async { request =>
        ws.url(s"http://$baseUrl/foo").post(equest.body.asJson.get).map(_ -> Ok(""))
    }
  }
}

我现在想创建一个测试，该测试发出假请求，并使用假服务器测试所有内容。按照https://www.playframework.com/documentation/2.7.x/ScalaTestingWebServiceClients，我尝试了以下操作：

class ControllersSpec extends PlaySpec with OneAppPerSuiteWithComponents {

  override lazy val components = new BuiltInComponentsFromContext(context) with NoHttpFiltersComponents with AhcWSComponents {
    lazy val myController = new MyController(controllerComponents, wsClient, "localhost:19001")

    lazy val router = new Routes(httpErrorHandler, myController)
  }

  "My Controller" should {
    "forward requests" in {
      Server.withRouterFromComponents(ServerConfig(port=Some(19001))) {
        import play.api.routing.sird._
        routes: BuiltInComponents => {
          case POST(p"/foo") =>
            routes.defaultActionBuilder {
              Ok("")
            }
        }
      } { port =>
        route(app, FakeRequest(POST, "/foo", FakeHeaders(), "{\"foo\": \"bar\"}")  // <-- line 86
      }
    }
  }
}

但是，尝试在以下位置运行此结果：

java.lang.IllegalStateException: cannot create children while terminating or terminated
    at akka.actor.dungeon.Children$class.makeChild(Children.scala:270)
    at akka.actor.dungeon.Children$class.attachChild(Children.scala:48)
    at akka.actor.ActorCell.attachChild(ActorCell.scala:370)
    at akka.stream.impl.ExtendedActorMaterializer.actorOf(ActorMaterializerImpl.scala:60)
    at akka.stream.impl.GraphStageIsland.onIslandReady(PhasedFusingActorMaterializer.scala:742)
    at akka.stream.impl.PhasedFusingActorMaterializer.materialize(PhasedFusingActorMaterializer.scala:507)
    at akka.stream.impl.PhasedFusingActorMaterializer.materialize(PhasedFusingActorMaterializer.scala:420)
    at akka.stream.impl.PhasedFusingActorMaterializer.materialize(PhasedFusingActorMaterializer.scala:415)
    at akka.stream.scaladsl.RunnableGraph.run(Flow.scala:496)
    at akka.stream.scaladsl.Source.runWith(Source.scala:83)
    at play.api.libs.streams.StrictAccumulator.run(Accumulator.scala:203)
    at play.api.test.EssentialActionCaller$class.call(Helpers.scala:249)
    at play.api.test.Helpers$.call(Helpers.scala:601)
    at play.api.test.RouteInvokers$class.route(Helpers.scala:271)
    at play.api.test.Helpers$.route(Helpers.scala:601)
    at play.api.test.RouteInvokers$class.route(Helpers.scala:281)
    at play.api.test.Helpers$.route(Helpers.scala:601)
    at controllers.ControllersSpec$$anonfun$1$$anonfun$apply$mcV$sp$2$$anonfun$3.apply(ControllersSpec.scala:86)

我假设测试服务器和应用程序对Akka的使用会产生干扰，并且其中一个会为另一项过早地终止工作，但是我不知道它们的工作原理是否足以完全理解它。我如何正确设置这样的测试？

Answer 1

如果您不介意使用外部库，我建议其中两个：

Play MockWS：

这可能是您想要的，只需按以下步骤进行设置即可：

val mockWs = MockWS {
  case ("POST", "/foo") => Action { Ok(Json.parse("{\"foo\": \"bar\"}")) }
}

override lazy val app: Application = new GuiceApplicationBuilder()
   //and override guice WSClient instance with MockWS
  .overrides(bind[WSClient].toInstance(mockWs))
  .build()

Siremock：

Siremock是Wiremock包装器。设置起来比较困难，但是，它具有模拟以外的许多其他功能，例如，验证您的请求是否确实发出：

val request = 
  (on(urlEqualTo("/foo")))
    .withHttpMethod(HttpMethods.POST)
    .withContentType("application/json")

request respond (aResponse withBody "{\"foo\": \"bar\"}")

//execute your test here

verify(request) wasCalled exactly(1)

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