Mockito doThrow() 方法使我的测试因给定异常而失败
Mockito doThrow() method makes my test fail with the given exception
我正在测试注入的 StatefulBeanToCsv 依赖项抛出异常时的错误情况。但是，Mockito 的 doThrow() 方法只是让我的测试失败，而不是允许使用 assertThrows().
验证该异常
我通过 BeanFactory 而不是 constructor/setter 注入我的 StatefulBeanToCsv 依赖项，因为我需要将 Writer 作为参数传递给它。
测试如下，未通过星号处。 CSV bean 在我的成功测试中工作正常 - 在这种情况下我能想到的主要区别是使用 do/when Mockito 模式而不是 when/then 一个在别处使用（不允许从 void 方法中抛出异常）：
@Test
void willThrowSwaggerListToCsvExceptionIfCsvWriterThrowsCsvException() throws CsvFieldAssignmentException {
// given
List<ApiSummary.Endpoint> endpointList = getEndpointList(6);
doReturn(endpointBeanToCsvMock)
.when(beanFactoryMock).getBean(eq(StatefulBeanToCsv.class), eq(ApiSummary.Endpoint.class), any(Writer.class), any(String[].class));
doThrow(CsvFieldAssignmentException.class)
* .when(endpointBeanToCsvMock).write(endpointList);
// when, then
assertThrows(SwaggerToCsvException.class, () -> underTest.listToResource(endpointList, ApiSummary.Endpoint.class));
}
我正在测试的方法如下（我希望星号处的无效“写入”方法抛出异常）。
public <T> ByteArrayResource listToResource(List<T> beanList, Class<T> clazz, String... columnOrder) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
try (Writer writer = new OutputStreamWriter(out)) {
StatefulBeanToCsv<T> beanToCsv = beanFactory.getBean(StatefulBeanToCsv.class, clazz, writer, columnOrder);
* beanToCsv.write(beanList);
} catch (CsvFieldAssignmentException | IOException e) {
throw new SwaggerToCsvException("Error converting List of type " + clazz.getSimpleName() + " to csv", e);
}
byte[] bytes = out.toByteArray();
return new ByteArrayResource(bytes);
}
我是不是漏掉了什么？
编辑 - 堆栈跟踪：
java.lang.InstantiationError: com.opencsv.exceptions.CsvFieldAssignmentException
at jdk.internal.reflect.GeneratedSerializationConstructorAccessor3.newInstance(Unknown Source)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
at org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.newInstance(SunReflectionFactoryInstantiator.java:48)
at org.objenesis.ObjenesisBase.newInstance(ObjenesisBase.java:73)
at org.mockito.internal.creation.instance.ObjenesisInstantiator.newInstance(ObjenesisInstantiator.java:21)
at org.mockito.internal.stubbing.answers.ThrowsExceptionForClassType.getThrowable(ThrowsExceptionForClassType.java:23)
at org.mockito.internal.stubbing.answers.AbstractThrowsException.validateFor(AbstractThrowsException.java:43)
at org.mockito.internal.stubbing.InvocationContainerImpl.addAnswer(InvocationContainerImpl.java:72)
at org.mockito.internal.stubbing.InvocationContainerImpl.setMethodForStubbing(InvocationContainerImpl.java:128)
at org.mockito.internal.handler.MockHandlerImpl.handle(MockHandlerImpl.java:53)
at org.mockito.internal.handler.NullResultGuardian.handle(NullResultGuardian.java:29)
at org.mockito.internal.handler.InvocationNotifierHandler.handle(InvocationNotifierHandler.java:33)
at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:82)
at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:56)
at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor$DispatcherDefaultingToRealMethod.interceptSuperCallable(MockMethodInterceptor.java:141)
at com.opencsv.bean.StatefulBeanToCsv$MockitoMock1003460.write(Unknown Source)
at com.foo.myproject.csv.CsvFactoryTest.willThrowSwaggerListToCsvExceptionIfCsvWriterThrowsCsvException(CsvFactoryTest.java:96)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
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:210)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)
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:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:143)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:143)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute[=12=](EngineExecutionOrchestrator.java:54)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)
正如 M.Deinum 在评论中提到的，这里的错误不是抛出异常，而是 Mockito 未能实例化异常，以便为您抛出它。
请注意 Mockito documentation 中的示例显示正在实例化的异常 - 也就是说，doThrow() 方法正在获取异常的实例，而不是异常的 class你想扔：
doThrow(new RuntimeException()).when(mockedList).clear();
Javadoc 也确实表明您可以提供一个 class，正如您所拥有的，并表示它将被实例化，但没有详细说明需要哪些构造函数。如果不亲自尝试，我猜这只适用于具有默认（无参数）构造函数的异常。
我正在测试注入的 StatefulBeanToCsv 依赖项抛出异常时的错误情况。但是，Mockito 的 doThrow() 方法只是让我的测试失败，而不是允许使用 assertThrows().
我通过 BeanFactory 而不是 constructor/setter 注入我的 StatefulBeanToCsv 依赖项，因为我需要将 Writer 作为参数传递给它。
测试如下，未通过星号处。 CSV bean 在我的成功测试中工作正常 - 在这种情况下我能想到的主要区别是使用 do/when Mockito 模式而不是 when/then 一个在别处使用（不允许从 void 方法中抛出异常）：
@Test
void willThrowSwaggerListToCsvExceptionIfCsvWriterThrowsCsvException() throws CsvFieldAssignmentException {
// given
List<ApiSummary.Endpoint> endpointList = getEndpointList(6);
doReturn(endpointBeanToCsvMock)
.when(beanFactoryMock).getBean(eq(StatefulBeanToCsv.class), eq(ApiSummary.Endpoint.class), any(Writer.class), any(String[].class));
doThrow(CsvFieldAssignmentException.class)
* .when(endpointBeanToCsvMock).write(endpointList);
// when, then
assertThrows(SwaggerToCsvException.class, () -> underTest.listToResource(endpointList, ApiSummary.Endpoint.class));
}
我正在测试的方法如下（我希望星号处的无效“写入”方法抛出异常）。
public <T> ByteArrayResource listToResource(List<T> beanList, Class<T> clazz, String... columnOrder) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
try (Writer writer = new OutputStreamWriter(out)) {
StatefulBeanToCsv<T> beanToCsv = beanFactory.getBean(StatefulBeanToCsv.class, clazz, writer, columnOrder);
* beanToCsv.write(beanList);
} catch (CsvFieldAssignmentException | IOException e) {
throw new SwaggerToCsvException("Error converting List of type " + clazz.getSimpleName() + " to csv", e);
}
byte[] bytes = out.toByteArray();
return new ByteArrayResource(bytes);
}
我是不是漏掉了什么？
编辑 - 堆栈跟踪：
java.lang.InstantiationError: com.opencsv.exceptions.CsvFieldAssignmentException
at jdk.internal.reflect.GeneratedSerializationConstructorAccessor3.newInstance(Unknown Source)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
at org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.newInstance(SunReflectionFactoryInstantiator.java:48)
at org.objenesis.ObjenesisBase.newInstance(ObjenesisBase.java:73)
at org.mockito.internal.creation.instance.ObjenesisInstantiator.newInstance(ObjenesisInstantiator.java:21)
at org.mockito.internal.stubbing.answers.ThrowsExceptionForClassType.getThrowable(ThrowsExceptionForClassType.java:23)
at org.mockito.internal.stubbing.answers.AbstractThrowsException.validateFor(AbstractThrowsException.java:43)
at org.mockito.internal.stubbing.InvocationContainerImpl.addAnswer(InvocationContainerImpl.java:72)
at org.mockito.internal.stubbing.InvocationContainerImpl.setMethodForStubbing(InvocationContainerImpl.java:128)
at org.mockito.internal.handler.MockHandlerImpl.handle(MockHandlerImpl.java:53)
at org.mockito.internal.handler.NullResultGuardian.handle(NullResultGuardian.java:29)
at org.mockito.internal.handler.InvocationNotifierHandler.handle(InvocationNotifierHandler.java:33)
at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:82)
at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:56)
at org.mockito.internal.creation.bytebuddy.MockMethodInterceptor$DispatcherDefaultingToRealMethod.interceptSuperCallable(MockMethodInterceptor.java:141)
at com.opencsv.bean.StatefulBeanToCsv$MockitoMock1003460.write(Unknown Source)
at com.foo.myproject.csv.CsvFactoryTest.willThrowSwaggerListToCsvExceptionIfCsvWriterThrowsCsvException(CsvFactoryTest.java:96)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
at org.junit.jupiter.engine.execution.InvocationInterceptorChain$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$invokeTestMethod(TestMethodTestDescriptor.java:210)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$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$executeRecursively(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:143)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:143)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:129)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively(NodeTestTask.java:127)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
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.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute[=12=](EngineExecutionOrchestrator.java:54)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)
正如 M.Deinum 在评论中提到的，这里的错误不是抛出异常，而是 Mockito 未能实例化异常，以便为您抛出它。
请注意 Mockito documentation 中的示例显示正在实例化的异常 - 也就是说，doThrow() 方法正在获取异常的实例，而不是异常的 class你想扔：
doThrow(new RuntimeException()).when(mockedList).clear();
Javadoc 也确实表明您可以提供一个 class，正如您所拥有的，并表示它将被实例化，但没有详细说明需要哪些构造函数。如果不亲自尝试，我猜这只适用于具有默认（无参数）构造函数的异常。