编辑:为将来的读者。我不知道这个问题是否会对您有很大帮助。有趣的逻辑已经发生了很大变化,因此我将关闭该问题,但不会删除。
我正在尝试为ViewModel编写一些单元测试。我正在使用Mockk和Junit5。
应该发生的情况:模拟的存储库返回了falseresponse,我在VM中称其为fun,它将livedata设置为false响应数据。
实际发生的情况:
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$1.invocation(JvmMockFactoryHelper.kt:25)
at io.mockk.proxy.jvm.advice.Interceptor.call(Interceptor.kt:20)
at com.nikolam.basketpro.data.DrillRepository.loadDrillTypes(DrillRepository.kt:11)
at com.nikolam.basketpro.ui.drills.selection.DrillsSelectionViewModel$fetchDrillTypes$1.invokeSuspend(DrillsSelectionViewModel.kt:41)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:241)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:594)
at kotlinx.coroutines.scheduling.CoroutineScheduler.access$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$0(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$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$6(TestMethodTestDescriptor.java:205)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:201)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:137)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:71)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:135)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.util.ArrayList.forEach(ArrayList.java:1257)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at java.util.ArrayList.forEach(ArrayList.java:1257)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:248)
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$5(DefaultLauncher.java:211)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:226)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:199)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:132)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
at com.intellij.rt.execution.junit.IdeaTestRunner$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()
}
}
}
DOC
fun loadDrillTypes(): Observable<DrillsType> {
return remoteDataSource.loadDrillTypes()
}
fun loadDrillList(drillType : String): Observable<Drill> {
return remoteDataSource.loadDrillList(drillType)
}
}
我试过的
从混合物中取出协程。我认为删除“ viewmodelscope.launch”将使测试工作正常,因为我认为它与协程有关,并且它们没有完成,或者没有及时完成,或者没有在适当的线程上侦听。
使用下面发布的2个扩展类进行了尝试(以替换JUnit4中的即时执行规则)
大量搜索以发现类似问题...
很长的帖子很抱歉,您需要随时询问更多信息或代码,如果可能的话还指出一些可以做得更好的错误/事情。任何带有解释的答案都非常感谢。我真的很想了解潜在的问题。非常感谢你!
编辑:我正在考虑这可能是由于RXKotlin
在您的setup()
方法中,您首先要创建一个视图模型,然后再在存储库中配置模拟响应。但是,您的viewmodel会尝试在实例化时立即从存储库中获取该响应(在实例中fetchDrillTypes()
调用该响应init
),因此它会在模拟就绪之前发生。您只需要对呼叫进行重新排序,setup()
以便drillsSelectionViewModel = ...
最后进行。
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我来说两句