在与Robolectric一起使用时，我开始在Mockito中遇到一个奇怪的ClassCastException。当我运行不使用Robolectric跑步者的相同测试时，一切都很顺利，没有异常被抛出。
这是堆栈跟踪：
org.mockito.exceptions.base.MockitoException:
ClassCastException occurred when creating the proxy.
You might experience classloading issues, disabling the Objenesis cache *might* help (see MockitoConfiguration)
at com.compassrosetech.ccs.android.test.ObservableCacheDispatcherTest.setUp(ObservableCacheDispatcherTest.java:63)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:236)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:158)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:211)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: java.lang.ClassCastException: kotlin.Function0$$EnhancerByMockitoWithCGLIB$$c0163e7f cannot be cast to org.mockito.cglib.proxy.Factory
at org.mockito.internal.creation.jmock.ClassImposterizer.createProxy(ClassImposterizer.java:128)
at org.mockito.internal.creation.jmock.ClassImposterizer.imposterise(ClassImposterizer.java:63)
at org.mockito.internal.creation.jmock.ClassImposterizer.imposterise(ClassImposterizer.java:56)
at org.mockito.internal.creation.CglibMockMaker.createMock(CglibMockMaker.java:23)
at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:26)
at org.mockito.internal.MockitoCore.mock(MockitoCore.java:51)
at org.mockito.Mockito.mock(Mockito.java:1243)
at org.mockito.internal.configuration.MockAnnotationProcessor.process(MockAnnotationProcessor.java:30)
at org.mockito.internal.configuration.MockAnnotationProcessor.process(MockAnnotationProcessor.java:16)
at org.mockito.internal.configuration.DefaultAnnotationEngine.createMockFor(DefaultAnnotationEngine.java:43)
at org.mockito.internal.configuration.DefaultAnnotationEngine.process(DefaultAnnotationEngine.java:66)
at org.mockito.internal.configuration.InjectingAnnotationEngine.processIndependentAnnotations(InjectingAnnotationEngine.java:71)
at org.mockito.internal.configuration.InjectingAnnotationEngine.process(InjectingAnnotationEngine.java:55)
at org.mockito.MockitoAnnotations.initMocks(MockitoAnnotations.java:108)
... 29 more
我正在使用的代码如下：
@RunWith(ApplicationTestRunner.class)
public class ObservableCacheDispatcherTest {
@Mock
private IDataMapper mockDataMapper;
@Mock
private ICache mockCache;
@Mock
private Function0<Object> mockLoader;
private ObservableCacheDispatcher cacheDispatcher;
@Before
public void setUp() {
MockitoAnnotations.initMocks(this); // <-- exception happens when executing this statement
cacheDispatcher = new ObservableCacheDispatcher(mockCache, mockDataMapper);
}
...
}
这就是Robolectric跑步者的样子：
public class ApplicationTestRunner extends RobolectricTestRunner {
//Maximun SDK Robolectric will compile (issues with SDK > 18)
private static final int MAX_SDK_SUPPORTED_BY_ROBOLECTRIC = 18;
private static final String ANDROID_MANIFEST_PATH = "../app/src/main/AndroidManifest.xml";
private static final String ANDROID_MANIFEST_RES_PATH = "../app/src/main/res";
/**
* Call this constructor to specify the location of resources and AndroidManifest.xml.
*
* @throws org.junit.runners.model.InitializationError
*/
public ApplicationTestRunner(Class<?> testClass) throws InitializationError {
super(testClass);
}
@Override protected AndroidManifest getAppManifest(Config config) {
return new AndroidManifest(Fs.fileFromPath(ANDROID_MANIFEST_PATH),
Fs.fileFromPath(ANDROID_MANIFEST_RES_PATH)) {
@Override
public int getTargetSdkVersion() {
return MAX_SDK_SUPPORTED_BY_ROBOLECTRIC;
}
};
}
}
我应该解决什么来摆脱这种异常？
答案 0 :(得分：9)
如建议
'禁用Objenesis缓存可能帮助'
您可以创建覆盖MockitoConfiguration 这样做
类文件
package org.mockito.configuration;
public class MockitoConfiguration extends DefaultMockitoConfiguration {
@Override
public boolean enableClassCache() {
return false;
}
}
尝试再次构建代码。
答案 1 :(得分：2)
我知道问题有点陈旧，但它可能有助于寻找答案的人。
添加
@PowerMockIgnore({ "org.mockito.*"})
之后
@RunWith(ApplicationTestRunner.class)
应该解决问题。
答案 2 :(得分：1)
这实际上不是Kotlin问题，而是Robolectric / Mockito。我相信它与类加载器有关。如果将Kotlin类替换为任何其他库接口（既不是JDK也不是项目的类），您将看到相同的异常。不幸的是，由于我不了解Robolectric内部，我认为没有解决方案。你最好向Robolectric或Mockito团队询问此事。
答案 3 :(得分：1)
我有类似的问题。基本上，你有一些你想要Mockito模拟的课程以及你希望PowerMock模拟的其他课程。我通过将@PowerMockIngore注释添加到我的测试类并使用常规模拟指定我想要模拟的类来解决它。所以在你的情况下，我想添加注释：
@PowerMockIgnore({"com.package.IDataMapper", "com.package.ICache" ..etc})
会起作用。
答案 4 :(得分：0)
解决方法谨慎！
请自担风险使用。
首先，你必须重新定义kotlin函数接口：
interface TestFunction0<R> : Function0<R>
interface TestFunction1<T1, R> : Function1<T1, R>
嘲笑它：
val onUpdate: TestFunction0<Unit> = mock()