scala - 当我添加对 Specs2 的依赖时，为什么我使用 Mockito 的一些 ScalaTest 测试会失败？

Question

我最近在一个项目中添加了对 Specs2 的依赖，并注意到一些使用 ScalaTest 和 Mockito 编写的现有测试失败了。删除 Specs2 后，这些测试再次通过。为什么会这样？

lazy val scalatestandspecscoexisting = Project(
  id = "scalatest-and-specs-coexisting",
  base = file("."),
  settings = Project.defaultSettings ++
    GraphPlugin.graphSettings ++
    Seq(
    name := "Scalatest-And-Specs-Coexisting",
    organization := "com.bifflabs",
    version := "0.1",
    scalaVersion := "2.9.2",
//  libraryDependencies ++= Seq(scalaTest, mockito)   //Tests Pass, no-specs2
    libraryDependencies ++= Seq(scalaTest, specs2, mockito)  //Tests Fail
  )
)

所有失败的测试都使用了 Mockito，并且都设置了一个带有两个不同参数的模拟方法。对模拟的调用之一不返回它设置的值。下面的例子失败了。进一步的要求是类型必须是 Function1(或具有 apply 方法)。

import org.scalatest.FunSuite
import org.scalatest.mock.MockitoSugar
import org.mockito.Mockito.when

trait MockingBird {
  //Behavior only reproduces when input is Function1
  def sing(input: Set[String]): String
}

class MockSuite extends FunSuite with MockitoSugar {

  val iWannaRock = Set("I wanna Rock")
  val rock = "Rock!"

  val wereNotGonnaTakeIt = Set("We're not gonna take it")
  val no = "No! We ain't gonna take it"

  test("A mock should match on parameter but isn't") {

    val mockMockingBird = mock[MockingBird]
    when(mockMockingBird.sing(iWannaRock)).thenReturn(rock)
    //Appears to return this whenever any Set is passed to sing
    when(mockMockingBird.sing(wereNotGonnaTakeIt)).thenReturn(no)

    // Succeeds because it was set up last
    assert(mockMockingBird.sing(wereNotGonnaTakeIt) === no)
    // Fails because the mock returns "No! We ain't gonna take it"
    assert(mockMockingBird.sing(iWannaRock) === rock)
  }
}

输出:

 [info] MockSuite:
 [info] - A mock should match on parameter but isn't *** FAILED ***
 [info]   "[No! We ain't gonna take it]" did not equal "[Rock!]" (MockSuite.scala:38)
 [error] Failed: : Total 1, Failed 1, Errors 0, Passed 0, Skipped 0

Answer 1

编辑 - 根据下面 Eric 的评论，这是 Specs2 ≤ 1.12.2 中的错误。应该在 1.12.3 中修复。

事实证明，Specs2 重新定义了 Mockito 中的一些行为，以便通过名称参数进行匹配。

Eric answered my question

"I don't like this, but that's the only way I found to match byname parameters: http://bit.ly/UF9bVC . You might want that."

来自 Specs2 文档

Byname

Byname parameters can be verified but this will not work if the specs2 jar is not put first on the classpath, before the mockito jar. Indeed specs2 redefines a Mockito class for intercepting method calls so that byname parameters are properly handled.

为了让我的测试再次通过，我做了与 specs2 文档中建议的相反的事情，并在 Mockito 之后添加了 Specs2 依赖项。我没有尝试过，但我预计按名称参数匹配会失败。

lazy val scalatestandspecscoexisting = Project(
  id = "scalatest-and-specs-coexisting",
  base = file("."),
  settings = Project.defaultSettings ++
    GraphPlugin.graphSettings ++
    Seq(
    name := "Scalatest-And-Specs-Coexisting",
    organization := "com.bifflabs",
    version := "0.1",
    scalaVersion := "2.9.2",
//  libraryDependencies ++= Seq(scalaTest, mockito)   //Tests Pass
    libraryDependencies ++= Seq(scalaTest, mockito, specs2)  //Tests Pass
//  libraryDependencies ++= Seq(scalaTest, specs2, mockito)  //Tests Fail
  )
)

我的测试现在通过了

[info] MockSuite:
[info] - A mock should match on parameter but isn't
[info] Passed: : Total 1, Failed 0, Errors 0, Passed 1, Skipped 0