你如何在 Mockito 中模拟 scala 调用名称答案

【问题标题】：How do you mock scala call-by name in Mockito你如何在 Mockito 中模拟 scala 调用名称
【发布时间】：2016-02-02 22:07:27
【问题描述】：

我试图在 mockito 中模拟 scala 的名称调用方法。但是遇到了这个错误。

如果匹配器与原始值组合，则可能会发生此异常： //不正确： someMethod(anyObject(), "原始字符串");使用匹配器时，所有参数都必须由匹配器提供。例如： //正确的： someMethod(anyObject(), eq("String by matcher"));

任何建议将不胜感激。谢谢！

这里是示例代码和测试文件：这里我试图模拟 createCommand 函数。并给出一个模拟，以便我可以验证 execute 是否被调用。

  package com.example

  class Command(key: String, func: => Long) {
    def execute(): Long = {
      println("Command.execute")
      println("key = " + key)
      println("func = " + func)
      func
    }

  }

  class CacheHelper {


    def createCommand(cacheKey: String, func: => Long): Command = {
      println("cacheKey = " + cacheKey)
      println("func = " + func)
      new Command(cacheKey, func)
      //    Mock this method
    }

    def getOrElse(cacheKey: String)(func: => Long): Long = {

      println("circuitBreakerEnabled = " + isCircuitBreakerEnabled)
      if (isCircuitBreakerEnabled) {
        val createCommand1: Command = createCommand(cacheKey, func)
        println("createCommand1 = " + createCommand1)
        createCommand1.execute()
      }
      else {
        util.Random.nextInt()
      }
    }

    def isCircuitBreakerEnabled: Boolean = {
      println("CacheHelper.isCircuitBreakerEnabled")
      false
    }
  }

  import com.example.{CacheHelper, Command}
  import org.mockito.Matchers._
  import org.mockito.Mockito._
  import org.scalatest.{Matchers, _}
  import org.scalatest.mock.MockitoSugar

  class ExampleSpec extends FlatSpec with Matchers with BeforeAndAfter with MockitoSugar {

    "it" should "call commands execute" in {
      val cacheHelper: CacheHelper = new CacheHelper
      val commandMock: Command = mock[Command]
      val spyCacheHelper = spy(cacheHelper)

      when(spyCacheHelper.isCircuitBreakerEnabled).thenReturn(true)
      when(spyCacheHelper.createCommand(any(), anyLong())).thenReturn(commandMock)

      val result: Long = spyCacheHelper.getOrElse("key")(1L)
      println("result = " + result)
      verify(commandMock).execute()

    }

  }

【问题讨论】：

您需要包含更多错误堆栈跟踪信息，以便有人帮助您回答这个问题。
您已将值作为参数 anyLong() 发送，但您必须从 Unit => Long 发送一些函数
我收到Unit=>Long 的错误，因为这是名称参数调用，而不是功能参数。
以下是依赖项，如果有人想尝试一下：libraryDependencies += "org.mockito" % "mockito-all" % "1.10.19" % "test" libraryDependencies += "org.scalatest" %% "scalatest" % "2.2.4" % "test"
继续关注这个：github.com/mockito/mockito/issues/1134

标签： scala unit-testing mockito scala-java-interop

【解决方案1】：

Mockito 无法做到这一点：Verifying by-name parameters in Mockito

应该可以用 scalamock 做到这一点： How to mock a call-by-name argument (like getOrElse) using ScalaMock?

【讨论】：

【解决方案2】：

您可以使用https://github.com/mockito/mockito-scala

import com.example.{CacheHelper, Command}
import org.mockito.ArgumentMatchersSugar._
import org.mockito.IdiomaticMockito
import org.scalatest.{Matchers, _}

  class ExampleSpec extends FlatSpec with Matchers with BeforeAndAfter with IdiomaticMockito {

    "it" should "call commands execute" in {
      val cacheHelper: CacheHelper = new CacheHelper
      val commandMock: Command = mock[Command]
      val spyCacheHelper = spy(cacheHelper)

      spyCacheHelper.isCircuitBreakerEnabled shouldReturn true
      spyCacheHelper.createCommand(any[String], any[Long]) shouldReturn commandMock 

      val result: Long = spyCacheHelper.getOrElse("key")(1L)
      println("result = " + result)
      verify(commandMock).execute()

    }

  }

【讨论】：