如何在Kotin中使用Mockito模拟方法调用并返回模拟值？

时间：2018-07-30 13:34:32

标签： unit-testing kotlin mockito

有人可以帮助我弄清楚为什么我嘲笑并命名为“ repo”的kotlin变量仍在执行一种方法，告诉模仿者嘲笑吗？让我告诉你我的意思：

我有一个简单的用例类，如下所示：

class WeatherDetailsPresenter @Inject constructor(var getCurrentWeatherWithForecastUsecase: GetCurrentWithForcastedWeatherUsecase) : BaseMvpPresenter<WeatherDetailsView>() {

fun presentCurrentAndForcastedWeather(country: String?) {
    with{getCurrentWeatherWithForecastUsecase) {
        this.countyName = country
        execute(object : DefaultSubscriber<Pair<CurrentWeatherModel, ForecastedWeatherModel>>() {
            override fun onSubscribe(d: Disposable) {
                super.onSubscribe(d)
                showLoading(true)
            }

            override fun onNext(t: Pair<CurrentWeatherModel, ForecastedWeatherModel>) {
                super.onNext(t)
                view?.showCurrentWeather(t.first)
            }

            override fun onComplete() {
                super.onComplete()
                showLoading(false)
            }
        })
    } 
}

}

它所要做的就是将国家名称传递给它，它会获得该国家的平均天气以及7天的天气预报。没什么大不了的。它将所有内容组合在一起并更新视图（MVP）。它从另一个名为WeatherDataRepository的类中获取数据，只要它返回我们不在乎的数据，该类的实现就不会导入。

让我告诉您getCurrentWeatherWithForecastUsecase类实际上是什么样的：

class GetCurrentWithForcastedWeatherUsecase @Inject constructor(var weatherRepo: WeatherDataRepository) : BaseUseCase() {

var countyName: String? = null

override fun buildUseCaseObservable(): Observable<Pair<CurrentWeatherModel, ForecastedWeatherModel>> {
   return weatherRepo.fetchCurrentWeatherWith7dayForcast(countyName.toString())
}

}

///看到它很容易，它只需要一个weatherRepository并要求它获取结果。我将其发送回给将显示它的呼叫者。

现在您知道此简单方法的作用，让我向您展示我要测试的内容。我只想简单地测试一下是否显示了当前天气。所以最后我真的想测试是否调用了view?.showCurrentWeather(t.first)。

这是我的junit测试用例：

class WeatherDetailsPresenterTest {

lateinit var usecase: GetCurrentWithForcastedWeatherUsecase

@Mock
 lateinit var repo: WeatherDataRepository

@Mock
lateinit var view: WeatherDetailsView

lateinit var presenter: WeatherDetailsPresenter



@Before
fun setUp() {
    MockitoAnnotations.initMocks(this)
    usecase = GetCurrentWithForcastedWeatherUsecase(repo)
    presenter = WeatherDetailsPresenter(usecase)

}

@Test
fun testCurrentWeatherScreenAppears() {

    //arrange

//WHY IS THIS MOCK NOT WORKING ??        
Mockito.`when`(repo.fetchCurrentWeatherWith7dayForcast(anyString())).thenReturn(Observable.just(Pair<CurrentWeatherModel, ForecastedWeatherModel>(ArgumentMatchers.any(CurrentWeatherModel::class.java),ArgumentMatchers.any(ForecastedWeatherModel::class.java))))

    //act
    val testSubscriber = TestObserver<Pair<CurrentWeatherModel, ForecastedWeatherModel>>()
    usecase.execute(testSubscriber)


    //assert
    testSubscriber.assertNoErrors()
    testSubscriber.assertSubscribed()
    testSubscriber.assertValue(Pair(ArgumentMatchers.any(), ArgumentMatchers.any()))
    testSubscriber.assertComplete()

    Mockito.verify(view,times(1)).showCurrentWeather(any())
}

}

单元测试将编译并运行。问题是存储库调用实际上是在调用fetchCurrentWeatherWith7dayForcast而不是仅仅返回模拟响应。

这是我运行测试用例时的错误（失败错误）：

java.lang.NullPointerException
at me.org.myweatherapp.data.repositories.WeatherDataRepository.fetchCurrentWeatherWith7dayForcast(WeatherDataRepository.kt:17)
at me.org.myweatherapp.presentation.view.mvp.mainScreen.fragments.weatherdetails.WeatherDetailsPresenterTest.testCurrentWeatherScreenAppears(WeatherDetailsPresenterTest.kt:61)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

您无需查看存储库代码，但无论如何我都会显示它：

class WeatherDataRepository @Inject constructor(val retrofit: Retrofit){

//THIS SHOULD NEVER BE CALLED, SINCE IM MOCKING IT, BUT ITS CALLED, WHY??
fun fetchCurrentWeatherWith7dayForcast(countyName: String): Observable<Pair<CurrentWeatherModel, ForecastedWeatherModel>> {
    val weatherApiService = retrofit.create(WeatherApi::class.java)
    return weatherApiService.getCurrentWeather(countyName)
            .zipWith<ForecastedWeatherModel,Pair<CurrentWeatherModel, ForecastedWeatherModel>>(weatherApiService.getForecastedWeather(countyName)
                    .map{model-> model.forecast?.forecastday?.forEach { it?.dayName= getDay(it?.date.toString())}; model }
                    , BiFunction { t1, t2 -> Pair(t1,t2) })

    }}

我已经注释了要模拟的仓库，然后在设置中初始化了所有模拟，所以我唯一想到的就是我没有立即使用Mockito.when命令？任何帮助表示赞赏。

更新：

这里是故障的整个堆栈轨迹：

"/Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java" -ea -Didea.test.cyclic.buffer.size=1048576 -Didea.launcher.port=57805 "-Didea.launcher.bin.path=/Applications/Android Studio.app/Contents/bin" -Dfile.encoding=UTF-8 -classpath "/Applications/Android Studio.app/Contents/lib/idea_rt.jar:/Applications/Android Studio.app/Contents/plugins/junit/lib/junit-rt.jar:/Applications/Android 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transforms-1/files-1.1/constraint-layout-1.0.2.aar/3eb445c5139d11809f5142c08a3b669a/jars/classes.jar:/Users/me/.gradle/caches/modules-2/files-2.1/junit/junit/4.12/2973d150c0dc1fefe998f834810d68f278ea58ec/junit-4.12.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/play-services-base-11.8.0.aar/6022e015ee3a8def24bc31049a72d6b5/res:/Users/me/.gradle/caches/transforms-1/files-1.1/play-services-base-11.8.0.aar/6022e015ee3a8def24bc31049a72d6b5/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/espresso-idling-resource-3.0.1.aar/12c9fd22796fd8b15ccaf8884ae23c20/jars/classes.jar:/Users/me/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk8/1.2.21/86407aed2dc197bd5f61d16e759c4ff43678732a/kotlin-stdlib-jdk8-1.2.21.jar:/Users/me/.gradle/caches/modules-2/files-2.1/com.rubylichtenstein/rxtest/1.0.7/43a4d1a2b4dcc14c669f4be81680a4e4b7d3dd1e/rxtest-1.0.7.jar:/Users/me/.gradle/caches/modules-2/files-2.1/com.squareup.picasso/picasso/2.5.2/7446d06ec8d4f7ffcc53f1da37c95f200dcb9387/picasso-2.5.2.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/livedata-core-1.1.0.aar/518c06f36c54349dedb9b4d7d98fdde5/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/play-services-tasks-11.8.0.aar/c516e10968cea0d1c7a34bf5a433c591/jars/classes.jar:/Users/me/.gradle/caches/modules-2/files-2.1/com.squareup.okhttp3/mockwebserver/3.8.0/6bcc6566897ffae93c62e53ff8e8e71af18d7593/mockwebserver-3.8.0.jar:/Users/me/.gradle/caches/modules-2/files-2.1/com.hannesdorfmann.mosby/mvp-common/2.0.1/d75c9c5577143f3cf3fd63f61526a551f910b56f/mvp-common-2.0.1.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/play-services-auth-11.8.0.aar/860f44f092aa569d6e12cc2a8b2f1f16/res:/Users/me/.gradle/caches/transforms-1/files-1.1/play-services-auth-11.8.0.aar/860f44f092aa569d6e12cc2a8b2f1f16/jars/classes.jar:/Users/me/.gradle/caches/modules-2/files-2.1/android.arch.core/common/1.1.0/8007981f7d7540d89cd18471b8e5dcd2b4f99167/common-1.1.0.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/timberkt-1.3.0.aar/3061f0b036f5136e670a5c16d103a232/jars/classes.jar:/Users/me/.gradle/caches/modules-2/files-2.1/net.bytebuddy/byte-buddy-agent/1.6.14/ba1e5ba3a84fb2fbf2f4de9138df19665eec4d59/byte-buddy-agent-1.6.14.jar:/Users/me/.gradle/caches/modules-2/files-2.1/org.mockito/mockito-core/2.8.9/1afb35b2d77d40567756c379e54c18da3574a96e/mockito-core-2.8.9.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/firebase-auth-license-11.8.0.aar/c11a9a832d941e454c91804c30c3b8e5/jars/classes.jar:/Users/me/Documents/mystuff/weatherappdemo/app/build/intermediates/sourceFolderJavaResources/test/prod/debug:/Users/me/Documents/mystuff/weatherappdemo/app/build/tmp/kotlin-classes/prodDebugUnitTest:/Users/me/Documents/mystuff/weatherappdemo/app/build/tmp/kapt3/classes/prodDebugUnitTest:/Users/me/Documents/mystuff/weatherappdemo/app/build/intermediates/sourceFolderJavaResources/prod/debug:/Users/me/Documents/mystuff/weatherappdemo/app/build/tmp/kapt3/classes/prodDebug:/Users/me/Documents/mystuff/weatherappdemo/app/build/tmp/kotlin-classes/prodDebug:/Users/me/Documents/mystuff/weatherappdemo/app/build/generated/mockable-android-27.v3.jar" com.intellij.rt.execution.application.AppMainV2 com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 me.org.weatherapp.presentation.view.mvp.mainScreen.fragments.weatherdetails.WeatherDetailsPresenterTest

java.lang.NullPointerException
    at me.org.weatherapp.data.repositories.WeatherDataRepository.fetchCurrentWeatherWith7dayForcast(WeatherDataRepository.kt:17)
    at me.org.weatherapp.presentation.view.mvp.mainScreen.fragments.weatherdetails.WeatherDetailsPresenterTest.testCurrentWeatherScreenAppears(WeatherDetailsPresenterTest.kt:49)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:78)
    at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:84)
    at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:39)
    at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:161)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:131)

1 个答案:

答案 0 :(得分：0)

我终于看到了我的问题。我太复杂了。首先，演示者应订阅可观察对象，因此我的baseUseCase应该看起来像这样：

public abstract class BaseUseCase {

protected abstract Observable buildUseCaseObservable();

@SuppressWarnings("unchecked")
public Observable retrieveUseCaseObservable(){
            return  this.buildUseCaseObservable()
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread());
}

}

然后，实际的测试用例只是模拟用例并查看并测试演示者，现在看来一切正常：

    import org.junit.Before
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.ArgumentMatchers.any
import org.mockito.BDDMockito
import org.mockito.BDDMockito.given
import org.mockito.Mock
import org.mockito.MockitoAnnotations
import org.mockito.runners.MockitoJUnitRunner


@RunWith(MockitoJUnitRunner::class)
class WeatherDetailsPresenterTest {

    @Mock
    lateinit var usecase: GetCurrentWithForcastedWeatherUsecase

    @Mock
    lateinit var view: WeatherDetailsView

    lateinit var presenter: WeatherDetailsPresenter

    @Before
    fun setUp() {
        MockitoAnnotations.initMocks(this)
        RxAndroidPlugins.setInitMainThreadSchedulerHandler { Schedulers.trampoline() }
        presenter = WeatherDetailsPresenter(usecase)
        presenter.attachView(view)

    }

    @Test
    fun testCurrentWeatherScreenAppears() {

        //arrange
        given(usecase.retrieveUseCaseObservable()).willReturn(Observable.just(Pair(CurrentWeatherModel(), ForecastedWeatherModel())))

        //act
        presenter.presentCurrentAndForcastedWeather("canada")

        //assert
        BDDMockito.verify(view, BDDMockito.times(1)).showCurrentWeather(any(CurrentWeatherModel::class.java)?:CurrentWeatherModel())
    }
}

the elvis operation is to satisfy kotlin

当我们做演示者呼叫记录时，现在我正在演示者内部进行订阅：

fun presentCurrentAndForcastedWeather(country: String?) {
    getCurrentWeatherWithForecastUsecase.takeUnless { country?.isBlank() == true }?.apply {
        this.countyName = country
        retrieveUseCaseObservable().subscribe(object : DefaultSubscriber<Pair<CurrentWeatherModel, ForecastedWeatherModel>>() {
            override fun onSubscribe(d: Disposable) {
                super.onSubscribe(d)
                showLoading(true)
            }

            override fun onNext(t: Pair<CurrentWeatherModel, ForecastedWeatherModel>) {
                super.onNext(t)
                view?.showCurrentWeather(t.first)
                view?.showForcastWeather(t.second)
            }

            override fun onError(e: Throwable) {
                super.onError(e)
                showError { this@WeatherDetailsPresenter.presentCurrentAndForcastedWeather(country) }
            }

            override fun onComplete() {
                super.onComplete()
                showLoading(false)
            }
        })
    } ?: run { view?.showCountryUnavailable() }
}

我还添加了RxAndroidPlugins.setInitMainThreadSchedulerHandler {Schedulers.trampoline（）}  告诉rxJava系统在当前线程上运行，因为无论如何都嘲笑了一切。

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