Plays 中的 Specs2 测试给我“找不到类型为 org 的证据参数的隐式值。specs2.main.CommandLineAsResult

Question

我正在尝试为 Play2/Scala send/receives JSON 中的简单 REST API 编写测试用例。我的测试如下所示：

import org.junit.runner.RunWith
import org.specs2.matcher.JsonMatchers
import org.specs2.mutable._
import org.specs2.runner.JUnitRunner
import play.api.libs.json.{Json, JsArray, JsValue}
import play.api.test.Helpers._
import play.api.test._
import play.test.WithApplication

/**
  * Add your spec here.
  * You can mock out a whole application including requests, plugins etc.
  * For more information, consult the wiki.
  */

@RunWith(classOf[JUnitRunner])
class APIv1Spec extends Specification with JsonMatchers {

  val registrationJson = Json.parse("""{"device":"576b9cdc-d3c3-4a3d-9689-8cd2a3e84442", |
                             "firstName":"", "lastName":"Johnny", "email":"justjohnny@test.com", |
                             "pass":"myPassword", "acceptTermsOfService":true}
                                """)

  def dropJsonElement(json : JsValue, element : String) = (json \ element).get match {
    case JsArray(items) => util.dropAt(items, 1)
  }

  def invalidRegistrationData(remove : String) = {
    dropJsonElement(registrationJson,remove)
  }

  "API" should {

    "Return Error on missing first name" in new WithApplication {

      val result= route(
        FakeRequest(
          POST,
          "/api/v1/security/register",
          FakeHeaders(Seq( ("Content-Type", "application/json") )),
          invalidRegistrationData("firstName").toString()
        )
      ).get

      status(result) must equalTo(BAD_REQUEST)
      contentType(result) must beSome("application/json")
    }
    ...

然而，当我尝试运行 sbt test 时，出现以下错误：

Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=384M; support was removed in 8.0
[info] Loading project definition from /home/cassius/brentspace/esalestracker/project
[info] Set current project to eSalesTracker (in build file:/home/cassius/brentspace/esalestracker/)
[info] Compiling 3 Scala sources to /home/cassius/brentspace/esalestracker/target/scala-2.11/test-classes...
[error] /home/cassius/brentspace/esalestracker/test/APIv1Spec.scala:34: could not find implicit value for evidence parameter of type org.specs2.main.CommandLineAsResult[play.test.WithApplication{val result: scala.concurrent.Future[play.api.mvc.Result]}]
[error]     "Return Error on missing first name" in new WithApplication {
[error]                                          ^
[error] one error found
[error] (test:compileIncremental) Compilation failed
[error] Total time: 3 s, completed 18/01/2016 9:30:42 PM

我在其他应用程序中也有类似的测试，但看起来新版本的 specs 增加了很多对 Futures 的支持和其他使以前的教程失效的东西。我使用的是 Scala 2.11.6、Activator 1.3.6，我的 build.sbt 如下所示：

name := """eSalesTracker"""

version := "1.0-SNAPSHOT"

lazy val root = (project in file(".")).enablePlugins(PlayScala)

scalaVersion := "2.11.6"

libraryDependencies ++= Seq(
  jdbc,
  cache,
  ws,
  "com.typesafe.slick" %% "slick"      % "3.1.0",
  "org.postgresql" % "postgresql" % "9.4-1206-jdbc42",
  "org.slf4j" % "slf4j-api" % "1.7.13",
  "ch.qos.logback" % "logback-classic" % "1.1.3",
  "ch.qos.logback" % "logback-core" % "1.1.3",
  evolutions,
  specs2 % Test,
  "org.specs2" %% "specs2-matcher-extra" % "3.7" % Test
)

resolvers += "scalaz-bintray" at "http://dl.bintray.com/scalaz/releases"
resolvers += Resolver.url("Typesafe Ivy releases", url("https://repo.typesafe.com/typesafe/ivy-releases"))(Resolver.ivyStylePatterns)

// Play provides two styles of routers, one expects its actions to be injected, the
// other, legacy style, accesses its actions statically.
routesGenerator := InjectedRoutesGenerator

Answer 1

我认为您使用了错误的 WithApplication 导入。使用这个：

import play.api.test.WithApplication

Answer 2

测试用例的最后一行应该是assertion/evaluation语句。

例如在失败的测试用例方法的最后一个 } 之前再次放置语句 false must beEqualTo(true) 和运行。

Plays 中的 Specs2 测试给我“找不到类型为 org 的证据参数的隐式值。specs2.main.CommandLineAsResult

Specs2 test within plays gives me "could not find implicit value for evidence parameter of type org.specs2.main.CommandLineAsResult

scala

playframework

specs2

playframework-2.0