Android Kotlin 单元测试因 io.mockk.MockKException 失败：未找到答案
Android Kotlin Unit test failing with io.mockk.MockKException: no answer found for
编辑：对于未来的读者。我不知道这个问题是否会对你有帮助 much.The 乐趣的逻辑已经发生了巨大的变化，所以我关闭了这个问题，但不会删除它。
我正在尝试为我的 ViewModel 编写一些单元测试。我正在使用 Mockk 和 Junit5。
应该发生什么：
模拟存储库 returns fakeresponse，我在 VM 中调用 fun，它将 livedata 设置为假响应数据。
实际发生了什么：
Exception in thread "DefaultDispatcher-worker-2 @coroutine#1" io.mockk.MockKException: no answer found for: DrillRepository(#1).loadDrillTypes()
at io.mockk.impl.stub.MockKStub.defaultAnswer(MockKStub.kt:90)
at io.mockk.impl.stub.MockKStub.answer(MockKStub.kt:42)
at io.mockk.impl.recording.states.AnsweringState.call(AnsweringState.kt:16)
at io.mockk.impl.recording.CommonCallRecorder.call(CommonCallRecorder.kt:53)
at io.mockk.impl.stub.MockKStub.handleInvocation(MockKStub.kt:263)
at io.mockk.impl.instantiation.JvmMockFactoryHelper$mockHandler.invocation(JvmMockFactoryHelper.kt:25)
at io.mockk.proxy.jvm.advice.Interceptor.call(Interceptor.kt:20)
at com.nikolam.basketpro.data.DrillRepository.loadDrillTypes(DrillRepository.kt:11)
at com.nikolam.basketpro.ui.drills.selection.DrillsSelectionViewModel$fetchDrillTypes.invokeSuspend(DrillsSelectionViewModel.kt:41)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:241)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:594)
at kotlinx.coroutines.scheduling.CoroutineScheduler.access$runSafely(CoroutineScheduler.kt:60)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:740)
org.opentest4j.AssertionFailedError:
Expected :[DrillsType(drillType_title=title1, drillType_imageUrl=url1), DrillsType(drillType_title=title2, drillType_imageUrl=url2)]
Actual :null
<Click to see difference>
at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:55)
at org.junit.jupiter.api.AssertionUtils.failNotEqual(AssertionUtils.java:62)
at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:182)
at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:177)
at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:1124)
at com.nikolam.basketpro.ui.drills.selection.DrillsSelectionViewModelTest.drillTypeListWillBePopulatedOnSuccess(DrillsSelectionViewModelTest.kt:43)
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.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:686)
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)
at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod[=12=](ExecutableInvoker.java:115)
at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke[=12=](ExecutableInvoker.java:105)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod(TestMethodTestDescriptor.java:205)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:201)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:137)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:71)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:135)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.util.ArrayList.forEach(ArrayList.java:1257)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.util.ArrayList.forEach(ArrayList.java:1257)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248)
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute(DefaultLauncher.java:211)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:132)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
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)
这是测试
@ExtendWith(value = [InstantExecutorExtension::class, TestSchedulerExtension::class])
internal class DrillsSelectionViewModelTest{
val mockkDrillRepository = mockk<DrillRepository>()
lateinit var drillsSelectionViewModel : DrillsSelectionViewModel
@BeforeEach
fun setup(){
drillsSelectionViewModel = DrillsSelectionViewModel(mockkDrillRepository)
val fakeResponse = Observable.just(DrillsType("title1", "url1"), DrillsType("title2","url2"))
every{ mockkDrillRepository.loadDrillTypes()} returns fakeResponse
}
@Test
fun `should update the livedata with correct data from the repository`(){
drillsSelectionViewModel.fetchDrillTypes()
assertEquals(arrayListOf(DrillsType("title1", "url1"), DrillsType("title2","url2")), getValue(drillsSelectionViewModel.drillsTypeList.value))
}
}
这是测试中扩展的两个类
class InstantExecutorExtension : BeforeEachCallback, AfterEachCallback {
override fun beforeEach(context: ExtensionContext?) {
ArchTaskExecutor.getInstance().setDelegate(object : TaskExecutor() {
override fun executeOnDiskIO(runnable: Runnable) {
runnable.run()
}
override fun postToMainThread(runnable: Runnable) {
runnable.run()
}
override fun isMainThread(): Boolean {
return true
}
})
}
override fun afterEach(context: ExtensionContext?) {
ArchTaskExecutor.getInstance().setDelegate(null)
}
}
class TestSchedulerExtension : BeforeTestExecutionCallback, AfterTestExecutionCallback {
override fun beforeTestExecution(context: ExtensionContext?) {
RxJavaPlugins.setIoSchedulerHandler { Schedulers.trampoline() }
RxJavaPlugins.setComputationSchedulerHandler { Schedulers.trampoline() }
RxJavaPlugins.setNewThreadSchedulerHandler { Schedulers.trampoline() }
RxAndroidPlugins.setMainThreadSchedulerHandler { Schedulers.trampoline() }
}
override fun afterTestExecution(context: ExtensionContext?) {
RxJavaPlugins.reset()
RxAndroidPlugins.reset()
}
}
这是 SUT
class DrillsSelectionViewModel(private val repository: DrillRepository): ViewModel() {
private val compositeDisposable = CompositeDisposable()
private var _drillsTypeList = MutableLiveData<ArrayList<DrillsType>>()
val drillsTypeList: LiveData<ArrayList<DrillsType>>
get() = _drillsTypeList
init{
fetchDrillTypes()
}
fun fetchDrillTypes()
{
val list = ArrayList<DrillsType>()
viewModelScope.launch(Dispatchers.IO) {
compositeDisposable += repository.loadDrillTypes()
.subscribeWith(object : DisposableObserver<DrillsType>() {
override fun onError(e: Throwable) {
Log.d("TAG", e?.message)
}
override fun onNext(data: DrillsType) {
Log.d("TAG", "data is " + data.toString())
list.add(data)
}
override fun onComplete() {
Log.d("TAG", "COMPLETE")
_drillsTypeList.postValue(list)
}
})
}
}
override fun onCleared() {
super.onCleared()
if (!compositeDisposable.isDisposed) {
compositeDisposable.dispose()
}
}
}
文档
fun loadDrillTypes(): Observable<DrillsType> {
return remoteDataSource.loadDrillTypes()
}
fun loadDrillList(drillType : String): Observable<Drill> {
return remoteDataSource.loadDrillList(drillType)
}
}
我尝试了什么：
从组合中删除协程。我认为删除 "viewmodelscope.launch" 会使测试工作，因为我认为它与协同程序有关，它们没有及时完成或没有及时收听正确的线程。
尝试使用下面的 2 个扩展 类 posted（以替换 JUnit4 中的即时执行规则）
大量搜索以找到类似问题...
抱歉这么久 post，如果您需要任何更多信息或代码，请随时 ask.If 也可以指出一些错误/可以做得更好的事情。非常感谢任何带解释的答案。我真的很想了解根本问题是什么。非常感谢你！
编辑：我认为这可能是由于 RXKotlin
在您的 setup() 方法中，您首先创建一个视图模型，然后在存储库中配置您的模拟响应。但是，您的视图模型会尝试在实例化时立即从存储库中获取该响应（在从 init 块调用的 fetchDrillTypes() 中），因此它发生在模拟准备就绪之前。您只需要重新排序 setup() 中的调用，以便 drillsSelectionViewModel = ... 最后发生。
我在 io.mockk:mockk:$mockkVersion:1.11.0 工作的前一天收到此错误，但在第二天关闭 Android Studio 时它抛出了错误。
我做了 Build > Clean Project，然后 Build > Rebuild Project，一切正常。
编辑：对于未来的读者。我不知道这个问题是否会对你有帮助 much.The 乐趣的逻辑已经发生了巨大的变化，所以我关闭了这个问题，但不会删除它。
我正在尝试为我的 ViewModel 编写一些单元测试。我正在使用 Mockk 和 Junit5。
应该发生什么： 模拟存储库 returns fakeresponse，我在 VM 中调用 fun，它将 livedata 设置为假响应数据。
实际发生了什么：
Exception in thread "DefaultDispatcher-worker-2 @coroutine#1" io.mockk.MockKException: no answer found for: DrillRepository(#1).loadDrillTypes()
at io.mockk.impl.stub.MockKStub.defaultAnswer(MockKStub.kt:90)
at io.mockk.impl.stub.MockKStub.answer(MockKStub.kt:42)
at io.mockk.impl.recording.states.AnsweringState.call(AnsweringState.kt:16)
at io.mockk.impl.recording.CommonCallRecorder.call(CommonCallRecorder.kt:53)
at io.mockk.impl.stub.MockKStub.handleInvocation(MockKStub.kt:263)
at io.mockk.impl.instantiation.JvmMockFactoryHelper$mockHandler.invocation(JvmMockFactoryHelper.kt:25)
at io.mockk.proxy.jvm.advice.Interceptor.call(Interceptor.kt:20)
at com.nikolam.basketpro.data.DrillRepository.loadDrillTypes(DrillRepository.kt:11)
at com.nikolam.basketpro.ui.drills.selection.DrillsSelectionViewModel$fetchDrillTypes.invokeSuspend(DrillsSelectionViewModel.kt:41)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:241)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:594)
at kotlinx.coroutines.scheduling.CoroutineScheduler.access$runSafely(CoroutineScheduler.kt:60)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:740)
org.opentest4j.AssertionFailedError:
Expected :[DrillsType(drillType_title=title1, drillType_imageUrl=url1), DrillsType(drillType_title=title2, drillType_imageUrl=url2)]
Actual :null
<Click to see difference>
at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:55)
at org.junit.jupiter.api.AssertionUtils.failNotEqual(AssertionUtils.java:62)
at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:182)
at org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:177)
at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:1124)
at com.nikolam.basketpro.ui.drills.selection.DrillsSelectionViewModelTest.drillTypeListWillBePopulatedOnSuccess(DrillsSelectionViewModelTest.kt:43)
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.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:686)
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)
at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod[=12=](ExecutableInvoker.java:115)
at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke[=12=](ExecutableInvoker.java:105)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod(TestMethodTestDescriptor.java:205)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:201)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:137)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:71)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:135)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.util.ArrayList.forEach(ArrayList.java:1257)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.util.ArrayList.forEach(ArrayList.java:1257)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248)
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute(DefaultLauncher.java:211)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:132)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
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)
这是测试
@ExtendWith(value = [InstantExecutorExtension::class, TestSchedulerExtension::class])
internal class DrillsSelectionViewModelTest{
val mockkDrillRepository = mockk<DrillRepository>()
lateinit var drillsSelectionViewModel : DrillsSelectionViewModel
@BeforeEach
fun setup(){
drillsSelectionViewModel = DrillsSelectionViewModel(mockkDrillRepository)
val fakeResponse = Observable.just(DrillsType("title1", "url1"), DrillsType("title2","url2"))
every{ mockkDrillRepository.loadDrillTypes()} returns fakeResponse
}
@Test
fun `should update the livedata with correct data from the repository`(){
drillsSelectionViewModel.fetchDrillTypes()
assertEquals(arrayListOf(DrillsType("title1", "url1"), DrillsType("title2","url2")), getValue(drillsSelectionViewModel.drillsTypeList.value))
}
}
这是测试中扩展的两个类
class InstantExecutorExtension : BeforeEachCallback, AfterEachCallback {
override fun beforeEach(context: ExtensionContext?) {
ArchTaskExecutor.getInstance().setDelegate(object : TaskExecutor() {
override fun executeOnDiskIO(runnable: Runnable) {
runnable.run()
}
override fun postToMainThread(runnable: Runnable) {
runnable.run()
}
override fun isMainThread(): Boolean {
return true
}
})
}
override fun afterEach(context: ExtensionContext?) {
ArchTaskExecutor.getInstance().setDelegate(null)
}
}
class TestSchedulerExtension : BeforeTestExecutionCallback, AfterTestExecutionCallback {
override fun beforeTestExecution(context: ExtensionContext?) {
RxJavaPlugins.setIoSchedulerHandler { Schedulers.trampoline() }
RxJavaPlugins.setComputationSchedulerHandler { Schedulers.trampoline() }
RxJavaPlugins.setNewThreadSchedulerHandler { Schedulers.trampoline() }
RxAndroidPlugins.setMainThreadSchedulerHandler { Schedulers.trampoline() }
}
override fun afterTestExecution(context: ExtensionContext?) {
RxJavaPlugins.reset()
RxAndroidPlugins.reset()
}
}
这是 SUT
class DrillsSelectionViewModel(private val repository: DrillRepository): ViewModel() {
private val compositeDisposable = CompositeDisposable()
private var _drillsTypeList = MutableLiveData<ArrayList<DrillsType>>()
val drillsTypeList: LiveData<ArrayList<DrillsType>>
get() = _drillsTypeList
init{
fetchDrillTypes()
}
fun fetchDrillTypes()
{
val list = ArrayList<DrillsType>()
viewModelScope.launch(Dispatchers.IO) {
compositeDisposable += repository.loadDrillTypes()
.subscribeWith(object : DisposableObserver<DrillsType>() {
override fun onError(e: Throwable) {
Log.d("TAG", e?.message)
}
override fun onNext(data: DrillsType) {
Log.d("TAG", "data is " + data.toString())
list.add(data)
}
override fun onComplete() {
Log.d("TAG", "COMPLETE")
_drillsTypeList.postValue(list)
}
})
}
}
override fun onCleared() {
super.onCleared()
if (!compositeDisposable.isDisposed) {
compositeDisposable.dispose()
}
}
}
文档
fun loadDrillTypes(): Observable<DrillsType> {
return remoteDataSource.loadDrillTypes()
}
fun loadDrillList(drillType : String): Observable<Drill> {
return remoteDataSource.loadDrillList(drillType)
}
}
我尝试了什么：
从组合中删除协程。我认为删除 "viewmodelscope.launch" 会使测试工作，因为我认为它与协同程序有关，它们没有及时完成或没有及时收听正确的线程。
尝试使用下面的 2 个扩展 类 posted（以替换 JUnit4 中的即时执行规则）
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抱歉这么久 post，如果您需要任何更多信息或代码，请随时 ask.If 也可以指出一些错误/可以做得更好的事情。非常感谢任何带解释的答案。我真的很想了解根本问题是什么。非常感谢你！
编辑：我认为这可能是由于 RXKotlin
在您的 setup() 方法中，您首先创建一个视图模型，然后在存储库中配置您的模拟响应。但是，您的视图模型会尝试在实例化时立即从存储库中获取该响应（在从 init 块调用的 fetchDrillTypes() 中），因此它发生在模拟准备就绪之前。您只需要重新排序 setup() 中的调用，以便 drillsSelectionViewModel = ... 最后发生。
我在 io.mockk:mockk:$mockkVersion:1.11.0 工作的前一天收到此错误，但在第二天关闭 Android Studio 时它抛出了错误。
我做了 Build > Clean Project，然后 Build > Rebuild Project，一切正常。