与Kotlin测试异步失败的Mockito

我正在尝试为我的测试学习Mockito，但使用Kotlin时则更加复杂。 我想在我的演示者中测试一个函数，当调用者从存储库异步获取对象列表并从侦听器触发Success / onError时。 之后，主持人根据回调告诉视图做任何事情。

以下是测试代码：

@Mock lateinit var view: CategoriesActivityContract.View @Mock lateinit var repository: CategoriesRepository @Before fun setUp() { MockitoAnnotations.initMocks(this) } @Test fun shouldPassCategoriesToView2() { `doAnswer`({ it: InvocationOnMock? -> (it!!.arguments[0] as CategoriesRepository.OnGetCategoriesListener).onSuccess(DUMMY_CATEGORIES) null }).`when`(repository).getCategoriesAsync(any(CategoriesRepository.OnGetCategoriesListener::class.java)) val presenter: CategoriesActivityPresenter = CategoriesActivityPresenter(repository) presenter.bindView(view) presenter.loadCategories() `verify`(view).displayCategories(DUMMY_CATEGORIES) } 

这是测试的代码：

 override fun loadCategories() { repository.getCategoriesAsync(object: CategoriesRepository.OnGetCategoriesListener { override fun onSuccess(categories: List) { if (!categories.isEmpty()) { view?.displayCategories(categories) } else { view?.displayNoCategoriesError() } } override fun onError(message: String?) { view?.displayNoCategoriesError() } }) } 

并且测试失败并显示以下错误消息：

 java.lang.IllegalStateException: any(CategoriesRepository…riesListener::class.java) must not be null at com.boyukliev.verseattack.ui.categories.CategoriesActivityPresenterTest.shouldPassCategoriesToView2(CategoriesActivityPresenterTest.kt:60) 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:68) at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:74) 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:117) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84) 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.AppMain.main(AppMain.java:147) org.mockito.exceptions.misusing.InvalidUseOfMatchersException: Misplaced or misused argument matcher detected here: -> at com.boyukliev.verseattack.ui.categories.CategoriesActivityPresenterTest.shouldPassCategoriesToView2(CategoriesActivityPresenterTest.kt:60) You cannot use argument matchers outside of verification or stubbing. Examples of correct usage of argument matchers: when(mock.get(anyInt())).thenReturn(null); doThrow(new RuntimeException()).when(mock).someVoidMethod(anyObject()); verify(mock).someMethod(contains("foo")) This message may appear after an NullPointerException if the last matcher is returning an object like any() but the stubbed method signature expect a primitive argument, in this case, use primitive alternatives. when(mock.get(any())); // bad use, will raise NPE when(mock.get(anyInt())); // correct usage use Also, this error might show up because you use argument matchers with methods that cannot be mocked. Following methods *cannot* be stubbed/verified: final/private/equals()/hashCode(). Mocking methods declared on non-public parent classes is not supported. at org.mockito.internal.runners.DefaultInternalRunner$1$1.testFinished(DefaultInternalRunner.java:58) at org.junit.runner.notification.SynchronizedRunListener.testFinished(SynchronizedRunListener.java:56) at org.junit.runner.notification.RunNotifier$7.notifyListener(RunNotifier.java:190) at org.junit.runner.notification.RunNotifier$SafeNotifier.run(RunNotifier.java:72) at org.junit.runner.notification.RunNotifier.fireTestFinished(RunNotifier.java:187) at org.junit.internal.runners.model.EachTestNotifier.fireTestFinished(EachTestNotifier.java:38) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:331) 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:68) at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:74) 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:117) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84) 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.AppMain.main(AppMain.java:147) 

Answer 1

Mockito.any(Class)返回null （ [1] ， [2] ），它不被getCategoriesAsync方法接受。
您可以使用“不返回空值”的Mockito-Kotlin库来解决这个问题。