如何模拟伴侣lateinit var？

如何解决如何模拟伴侣lateinit var？

我尝试对演示者进行单元测试。我有更新标记的方法，当它失败时，应用程序会显示带有已翻译消息的吐司。

override fun updateMark(cameraId: Int,markId: Int,createData: MarkCreateData,context: Context) {
        view?.let {
            view?.showOrHideProgressBar(true)
            apiManager.updateMark(cameraId,markId,createData)
                    .subsIoObsMain()
                    .subscribe({
                        view?.showOrHideProgressBar(false)
                        view?.updateMarkSuccess()
                    }) {
                        view?.showOrHideProgressBar(false)
                        view?.showToast(getStringForLayoutByKey("mark_updated_fail"))
                    }.addTo(compositeDisposable)
        }
    }

提供翻译的方法包含在使用首选项的 LocalData对象中。

object LocalData {

    private val prefs: SharedPreferences = App.instance.getSharedPreferences(this.javaClass.simpleName,Context.MODE_PRIVATE)

    fun getStringForLayoutByKey(key: String) =
            if (getJsonDataServer().getByKeyOrKeySave(key).isNullOrEmpty()) {
                getJsonDataClient().getByKeyOrKeySave(key) ?: ""
            } else {
                getJsonDataServer().getByKeyOrKeySave(key) ?: ""
            }
}

使用伴随为Lateinit var的App.instance进行初始化。

class App @Inject constructor(): Application(),LifecycleObserver {

    companion object {
        @JvmStatic
        lateinit var instance: App

        @JvmField
        var localData: LocalData? = null
    }

    override fun onCreate() {
        ProcessLifecycleOwner.get().lifecycle.addObserver(this)
        super.onCreate()
        instance = this
        localData = LocalData
        buildDagger()
    }
}

所以我尝试运行单元测试。

@RunWith(MockitoJUnitRunner::class)
class PlayerPresenterTest {
    @Rule
    @JvmField
    val rule = ImmediateSchedulerRule()
    @Mock
    lateinit var apiManager: NetworkManager
    @Mock
    lateinit var playerFragment: PlayerContract.View
    @Mock
    lateinit var context: Context
    @Mock
    lateinit var unknownError: UnknownHostException
    @Mock
    lateinit var localData: LocalData
    @Mock
    lateinit var sharedPreferences: SharedPreferences
    @Mock
    lateinit var app: App.Companion
    @Mock
    lateinit var instance: App

    //variables
    private lateinit var playerPresenter: PlayerPresenter
    private lateinit var markCreateData: MarkCreateData
    private val errorMarkUpdate = "mark updated fail. try later"

    @Before
    fun setup() {
        MockitoAnnotations.initMocks(this)
        MockKAnnotations.init(this,relaxUnitFun = true)

        playerPresenter = PlayerPresenter()
        playerPresenter.attachView(playerFragment)
        playerPresenter.apiManager = apiManager
        markCreateData = MarkCreateData()
    }

    //try update mark and get error
    @Test
    fun test_failed_update_mark() {
        val error = Observable.error<Mark>(unknownError)
        whenever(apiManager.updateMark(cameraId.toInt(),markId.toInt(),markCreateData)).thenReturn(error)

        mockkObject(App)
        every { App } returns app
        every { app.instance } returns instance
        every { instance.getSharedPreferences(this.javaClass.simpleName,Context.MODE_PRIVATE) } returns sharedPreferences
        every { localData.getStringForLayoutByKey("mark_updated_fail") } returns errorMarkUpdate

        playerPresenter.updateMark(cameraId.toInt(),markCreateData,context)
        verify(playerFragment,atLeastOnce()).showToast(errorMarkUpdate)
    }
}

并得到错误“由以下原因引起：kotlin.UninitializedPropertyAccessException：lateinit属性实例尚未初始化” ，它引用了LocalData私有val首选项初始化。 smb可以帮我这个忙吗？ 如何在单元测试中初始化实例并避免该错误？或者也许我该如何在不使用App.instance的引用的情况下模拟LocalData对象？