如何模拟内部单例对象的字段? [英] How to mock fields of inner singleton objects?

问题描述

给出以下代码段

class Config {
  private val conf = ConfigFactory.load()

  object Http {
    val host = conf.getString("http.host")
    val port = conf.getInt("http.port")
  }
}

如何模拟内部单例对象Http的host和port字段?

how can host and port fields of inner singleton object Http be mocked?

推荐答案

mockito-scala 通过IdiomaticMockito

import org.mockito.stubbing.ReturnsDeepStubs
import org.mockito.{ArgumentMatchersSugar, IdiomaticMockito}

val config = mock[Config](ReturnsDeepStubs)
config.Http.host returns "www.example.com"
config.Http.port returns 80

没有深入的研究，我们可以做

Without deep stubbing we could do

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

val config = mock[Config]
val httpConfig = mock[config.Http.type]
when(httpConfig.host).thenReturn("www.example.com")
when(httpConfig.port).thenReturn(80)
when(config.Http).thenReturn(httpConfig)

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