在 play.api.test 中找不到 Play Framework 2.4 WithApplication 调用

Question

我正在尝试在 play framework 2.4 中简单测试一条路由，我按照此处的指南进行操作：https://www.playframework.com/documentation/2.4.x/ScalaFunctionalTestingWithSpecs2（测试路由器）

代码在这里

package routesAndController

import org.specs2.mutable._
import org.specs2.runner._
import org.junit.runner._

import play.api.test._
import play.api.test.Helpers._

/**
  * Created by root on 3/11/16.
  */
@RunWith(classOf[JUnitRunner])
class AnalysisEntryPointTest extends Specification {


  "the AnalysisEntryPoint" should {
    "where the route must be /DomoticRoomServer/Analysis with 200" in new WithApplication {
        val result = route(FakeRequest(GET, "/domoticRoom/analysis")).get

        status(result) must equalTo(OK)
        contentType(result) must beSome.which(_ == "text/html")
    }
  }
}

一切都很简单。问题是 Class 'WithApplication' 不在 play.api.test 包中，而是在 play.test 中。我尝试使用 api.test 中的对象，但 specs2 给我错误：

[error] /home/benkio/projects/DomoticRoom/Server/test/routesAndController/AnalysisEntryPointTest.scala:19: could not find implicit value for evidence parameter of type org.specs2.execute.AsResult[play.test.WithApplication{val result: scala.concurrent.Future[play.api.mvc.Result]}]
[error]     "where the route must be /DomoticRoomServer/Analysis with 200" in new WithApplication() {
[error]                                                                    ^
[error] one error found
[error] (test:compileIncremental) Compilation failed

有什么建议吗？

这里是 build.sbt:

import play.routes.compiler.InjectedRoutesGenerator
import play.sbt.PlayScala

name := """Domotic Room Server"""

version := "1.0-SNAPSHOT"

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

scalaVersion := "2.11.7"

resolvers ++= Seq(
  "scalaz-bintray" at "http://dl.bintray.com/scalaz/releases",
  "Sonatype OSS Snapshots" at "https://oss.sonatype.org/content/repositories/snapshots",
  "Millhouse Bintray"  at "http://dl.bintray.com/themillhousegroup/maven"
)

libraryDependencies ++= Seq(
  "com.typesafe.play" %% "play-cache" % "2.4.6",
  "org.specs2" %% "specs2-core" % "3.6" % "test",
  "org.specs2" %% "specs2-junit" % "3.6" % "test",
  "org.specs2" %% "specs2-scalacheck" % "3.6" % "test",
  "org.reactivemongo" %% "play2-reactivemongo" % "0.11.9",
  "com.themillhousegroup" %% "play2-reactivemongo-mocks" % "0.11.9_0.4.26"
)

// Play provides two styles of routers, one expects its actions to be injected, the
// other, legacy style, accesses its actions statically.
routesGenerator := InjectedRoutesGenerator
scalacOptions in Test ++= Seq("-Yrangepos")

fork in run := true

这是我的 project/plugin.sbt:

// The Typesafe repository
resolvers += "Typesafe repository" at "https://repo.typesafe.com/typesafe/releases/"

// The Play plugin
addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.4.6")

Answer 1

Play 有一个快捷方式来声明测试依赖项，包括它自己的包。添加 specs2 和 Play test 类的正确方法是：

libraryDependencies ++= Seq(
    "com.typesafe.play" %% "play-cache" % "2.4.6",
    "org.reactivemongo" %% "play2-reactivemongo" % "0.11.9",
    "com.themillhousegroup" %% "play2-reactivemongo-mocks" % "0.11.9_0.4.26",
    specs2 % Test
)

这是documented here. There is also a shortcut to use cache, as also documented here。所以你的依赖应该这样声明：

libraryDependencies ++= Seq(
    "org.reactivemongo" %% "play2-reactivemongo" % "0.11.9",
    "com.themillhousegroup" %% "play2-reactivemongo-mocks" % "0.11.9_0.4.26",
    cache,
    specs2 % Test
)

这里的好处是您不需要跟踪与 Play 兼容的依赖项。此外，您无需在所有依赖项中重复播放版本，只需在 project/plugins.sbt 文件中即可。

当然，您仍然可以根据需要覆盖和添加任何其他依赖项。您正在为每个实例添加 scalacheck：

libraryDependencies ++= Seq(
    "org.reactivemongo" %% "play2-reactivemongo" % "0.11.9",
    "com.themillhousegroup" %% "play2-reactivemongo-mocks" % "0.11.9_0.4.26",
    cache,
    specs2 % Test,
    "org.specs2" %% "specs2-scalacheck" % "3.6" % Test
)

讨论后编辑：

欢迎来到 Dependency Hell. Looks like that play2-reactivemongo and play2-reactivemongo-mocks are adding a very old specs2 dependency. You can see that by using sbt-dependency-graph and running sbt dependencyTree. Here is the complete output 以及相关部分：

[info]   +-com.themillhousegroup:play2-reactivemongo-mocks_2.11:0.11.9_0.4.27 [S]
[info]   | +-org.reactivemongo:play2-reactivemongo_2.11:0.11.10 [S]
[info]   | +-org.specs2:specs2_2.11:2.3.13 [S]

您还可以通过查看 play2-reactivemongo-mocks, play2-reactivemongo and Play Framework 2.4.6 的代码来了解这一点。这些不是 specs2 的兼容版本并且 sbt 无法驱逐旧版本，因为项目都在添加不同的 specs2 包（参见 play 如何添加特定依赖项与 play2-reactivemongo-mocks 对比）。

也就是说，play2-reactivemongo-mocks支持的测试貌似和Play支持的测试不兼容。您可以打开问题或提交拉取请求来解决此问题，但需要新版本的 play2-reactivemongo-mocks。

可能的解决方案

从 play2-reactive 依赖项中排除 specs2：

libraryDependencies ++= Seq(
  "org.reactivemongo" %% "play2-reactivemongo" % "0.11.10" exclude("org.specs2", "*"),
  "com.themillhousegroup" %% "play2-reactivemongo-mocks" % "0.11.9_0.4.27" exclude("org.specs2", "*"),
  cache,
  specs2 % Test,
  "org.specs2" %% "specs2-scalacheck" % "3.6" % Test
)

在 play.api.test 中找不到 Play Framework 2.4 WithApplication 调用

Play Framework 2.4 WithApplication call not found in play.api.test

integration-testing

specifications

scala

sbt

playframework

讨论后编辑：

可能的解决方案