问题：

在kotin中如何使用Mockito来模拟方法调用并返回模拟值？

南门鸿雪

2023-03-14

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)
            }
        })
    } 
}

让我向您展示getCurrentWeatherWithForecastUsecase类actgually是什么样子：

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

var countyName: String? = null

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

}

//这很容易，它只需要一个天气存储库，并要求它获取结果。我把它发送回调用者，调用者将显示它。

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())
}

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)

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) })

    }}

更新：

以下是故障的整个堆栈跟踪：

"/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 Studio.app/Contents/plugins/junit/lib/junit5-rt.jar:/Users/me/Library/Android/sdk/platforms/android-27/data/res:/Users/me/Documents/mystuff/weatherappdemo/app/build/intermediates/classes/prod/debug:/Users/me/Library/Android/sdk/extras/m2repository/com/android/support/constraint/constraint-layout-solver/1.0.2/constraint-layout-solver-1.0.2.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/support-v4-27.1.1.aar/8c528b77506492992ca9cefd2fbe3fc1/jars/classes.jar:/Users/me/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk7/1.2.21/88bfff5aa470143a83b0bc5ec00c0be8cabd7cad/kotlin-stdlib-jdk7-1.2.21.jar:/Users/me/.gradle/caches/modules-2/files-2.1/commons-cli/commons-cli/1.2/2bf96b7aa8b611c177d329452af1dc933e14501c/commons-cli-1.2.jar:/Users/me/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-reflect/1.2.41/e4d6728a4fa55dbfb510aeea25c072c7c51d94/kotlin-reflect-1.2.41.jar:/Users/me/.gradle/caches/modules-2/files-2.1/android.arch.lifecycle/common-java8/1.0.0/a7458929c2f84a8a59b6b4da631a36f07091cf79/common-java8-1.0.0.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/support-media-compat-27.1.1.aar/8c1ab73749282027c9894ed4f6387856/res:/Users/me/.gradle/caches/transforms-1/files-1.1/support-media-compat-27.1.1.aar/8c1ab73749282027c9894ed4f6387856/jars/classes.jar:/Users/me/.gradle/caches/modules-2/files-2.1/org.bouncycastle/bcprov-jdk15on/1.50/be504b4901d75cbe129a178f5830e6c358ec214c/bcprov-jdk15on-1.50.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/stetho-1.5.0.aar/f176def4c2ceb952e3ab306a7d56241a/jars/classes.jar:/Users/me/.gradle/caches/modules-2/files-2.1/org.jetbrains/annotations/13.0/919f0dfe192fb4e063e7dacadee7f8bb9a2672a9/annotations-13.0.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/rules-1.0.1.aar/88459f9e0846eb9599bad2e0efbab6bb/jars/classes.jar:/Users/me/.gradle/caches/modules-2/files-2.1/javax.inject/javax.inject/1/6975da39a7040257bd51d21a231b76c915872d38/javax.inject-1.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/play-services-auth-base-license-11.8.0.aar/1f271bdf7747c7247ce3e2d7b7a8ff8e/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/play-services-basement-license-11.8.0.aar/9ae67be5ece95255b9bcca7d0378d2b4/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/firebase-iid-11.8.0.aar/951a9ce1737846087ee53aaecfb671c0/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/support-fragment-27.1.1.aar/227f5a73c4224f35e666b27741d51529/jars/classes.jar:/Users/me/.gradle/caches/modules-2/files-2.1/com.squareup.retrofit2/retrofit/2.3.0/bcacde6a8ccedcc56c127403d26b76072fe6214d/retrofit-2.3.0.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/runtime-1.1.0.aar/506f9955d304b32a4564c4b84422fea4/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/design-27.1.1.aar/4f85b6a28d4b1cf224a5e6cb1d4dbc66/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/design-27.1.1.aar/4f85b6a28d4b1cf224a5e6cb1d4dbc66/res:/Users/me/.gradle/caches/transforms-1/files-1.1/runtime-1.0.0.aar/7af827a5af0341c7eceb2a9ffa27a39e/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/multidex-instrumentation-1.0.2.aar/d67f47874da4e87ad02796a65dc73f61/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/firebase-config-11.8.0.aar/bc62621a53fdb88540784b9828b13fde/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/appcompat-v7-27.1.1.aar/23e568de9f4f0daff9b5d756af53aa07/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/appcompat-v7-27.1.1.aar/23e568de9f4f0daff9b5d756af53aa07/res:/Users/me/.gradle/caches/modules-2/files-2.1/org.greenrobot/eventbus/3.0.0/ddd99896e9569eaababbe81b35d80e1b91c4ad85/eventbus-3.0.0.jar:/Users/me/.gradle/caches/modules-2/files-2.1/com.squareup.okhttp3/okhttp/3.8.0/5a11f020cce2d11eb71ba916700600e18c4547e7/okhttp-3.8.0.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/firebase-analytics-impl-11.8.0.aar/5b4765afdec874f91c04f5abe56e5275/jars/classes.jar:/Users/me/.gradle/caches/modules-2/files-2.1/android.arch.persistence.room/common/1.0.0/1cbd3ddc566125293b13af5c0a65bc015476e83c/common-1.0.0.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/runtime-1.1.0.aar/1fb10be0704f03034b6aa2314ccf3e4d/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/transition-27.1.1.aar/91b8eaec16a28ef6b3781544873a983d/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/transition-27.1.1.aar/91b8eaec16a28ef6b3781544873a983d/res:/Users/me/.gradle/caches/transforms-1/files-1.1/play-services-auth-base-11.8.0.aar/882aae6015201ef880d7ddb46766a289/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/butterknife-8.8.1.aar/cf0409e6eb4d8f95c289b322c09c7470/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/fbcore-1.3.0.aar/881eb80147e1a600eb4fdd7ca2ca248e/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/files-1.1/firebase-common-11.8.0.aar/7840ba4061070f9ac09a6db65e355818/jars/classes.jar:/Users/me/.gradle/caches/transforms-1/fil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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)

司空祯

2023-03-14

我终于看到我的问题了。我把它弄得太复杂了。首先，演示者应该订阅observable，所以我的baseUseCase应该如下所示：

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usecase和view，并测试演示者，现在一切似乎都正常了：

    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())
    }
}

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() }
}

在kotin中如何使用Mockito来模拟方法调用并返回模拟值？

共有1个答案

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