单元测试 – 当Power Mock在多个文件上运行Robolectric测试时,ClassCastException异常

概述所以我设置了基于参考指南 here的权力模拟.它似乎运行完美的一个单一的测试类.但是当执行多个JUnit测试时,我在第二个测试类上收到以下错误. 从下面的stacktrace可以看出,我试图模拟一个otto Bus实例.似乎在第一个测试类上正确地模拟,但是在第二个类中,我得到这个类转换异常. 在堆栈跟踪我建议禁用Objenisis缓存,但我不知道如何完成,如果这是根本原因,因为我正在使用class 所以我设置了基于参考指南 here的权力模拟.它似乎运行完美的一个单一的测试类.但是当执行多个JUnit测试时,我在第二个测试类上收到以下错误.

从下面的stacktrace可以看出,我试图模拟一个otto Bus实例.似乎在第一个测试类上正确地模拟,但是在第二个类中,我得到这个类转换异常.

在堆栈跟踪我建议禁用Objenisis缓存,但我不知道如何完成,如果这是根本原因,因为我正在使用classloading-xstream：1.6.2根据上面的Robolectric Wiki链接.

如果我运行一个单独的JUnit测试类,我的设置是很好的,但一旦我尝试在一个包中运行所有的测试,只有第一个测试可以工作,后续的测试将会得到类转换异常.

org.mockito.exceptions.base.MockitoException:     ClassCastException occurred while creating the mockito proxy :      class to mock : 'com.squareup.otto.Bus',loaded by classloader : 'org.robolectric.internal.bytecode.InstrumentingClassLoader@1593948d'      created class : 'com.squareup.otto.Bus$$EnhancerByMockitoWithcglib$a3b196',loaded by classloader : 'org.robolectric.internal.bytecode.InstrumentingClassLoader@1593948d'      proxy instance class : 'com.squareup.otto.Bus$$EnhancerByMockitoWithcglib$a3b196',loaded by classloader : 'org.mockito.internal.creation.util.SearchingClassLoader@618ff5c2'      instance creation by : ObjenesisInstantiator    You might experIEnce classloading issues,disabling the Objenesis cache *might* help (see MockitoConfiguration)        at org.powermock.API.mockito.repackaged.ClassImposterizer.imposterise(ClassImposterizer.java:61)        at org.powermock.API.mockito.repackaged.ClassImposterizer.imposterise(ClassImposterizer.java:49)        at org.powermock.API.mockito.repackaged.cglibMockMaker.createMock(cglibMockMaker.java:24)        at org.powermock.API.mockito.internal.mockmaker.PowerMockMaker.createMock(PowerMockMaker.java:45)        at com.acme.androID.myapp.services.gcm.handlers.RequestlogoutHandlerTest.setup(RequestlogoutHandlerTest.java:39)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)        at org.junit.runners.model.FrameworkMethod.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.RunBefores.evaluate(RunBefores.java:24)        at org.robolectric.RobolectricTestRunner.evaluate(RobolectricTestRunner.java:251)        at org.robolectric.RobolectricTestRunner.runchild(RobolectricTestRunner.java:188)        at org.robolectric.RobolectricTestRunner.runchild(RobolectricTestRunner.java:54)        at org.junit.runners.ParentRunner.run(ParentRunner.java:290)        at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71)        at org.junit.runners.ParentRunner.runchildren(ParentRunner.java:288)        at org.junit.runners.ParentRunner.access
package org.mockito.configuration;    public class MockitoConfiguration extends DefaultMockitoConfiguration {    @OverrIDe    public boolean enableClassCache() {        return false;    }}
0(ParentRunner.java:58)        at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268)        at org.robolectric.RobolectricTestRunner.evaluate(RobolectricTestRunner.java:152)        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)        at org.junit.runners.Suite.runchild(Suite.java:128)        at org.junit.runners.Suite.runchild(Suite.java:27)        at org.junit.runners.ParentRunner.run(ParentRunner.java:290)        at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71)        at org.junit.runners.ParentRunner.runchildren(ParentRunner.java:288)        at org.junit.runners.ParentRunner.access0(ParentRunner.java:58)        at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268)        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)        at org.junit.runner.JUnitCore.run(JUnitCore.java:137)        at com.intellij.junit4.JUnit4IDeaTestRunner.startRunnerWithArgs(JUnit4IDeaTestRunner.java:78)        at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:212)        at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)        at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)    Caused by: java.lang.classCastException: Cannot cast com.squareup.otto.Bus$$EnhancerByMockitoWithcglib$a3b196 to com.squareup.otto.Bus        at java.lang.class.cast(Class.java:3369)        at org.powermock.API.mockito.repackaged.ClassImposterizer.imposterise(ClassImposterizer.java:59)        at org.powermock.API.mockito.repackaged.ClassImposterizer.imposterise(ClassImposterizer.java:49)        at org.powermock.API.mockito.repackaged.cglibMockMaker.createMock(cglibMockMaker.java:24)        at org.powermock.API.mockito.internal.mockmaker.PowerMockMaker.createMock(PowerMockMaker.java:45)        at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:33)        at org.mockito.internal.MockitoCore.mock(MockitoCore.java:59)        at org.mockito.Mockito.mock(Mockito.java:1285)        at org.mockito.Mockito.mock(Mockito.java:1163)        ... 36 more    org.mockito.exceptions.base.MockitoException:     ClassCastException occurred while creating the mockito proxy :      class to mock : 'com.squareup.otto.Bus',disabling the Objenesis cache *might* help (see MockitoConfiguration)        at org.powermock.API.mockito.repackaged.ClassImposterizer.imposterise(ClassImposterizer.java:61)        at org.powermock.API.mockito.repackaged.ClassImposterizer.imposterise(ClassImposterizer.java:49)        at org.powermock.API.mockito.repackaged.cglibMockMaker.createMock(cglibMockMaker.java:24)        at org.powermock.API.mockito.internal.mockmaker.PowerMockMaker.createMock(PowerMockMaker.java:45)        at com.acme.androID.myapp.services.gcm.handlers.RequestlogoutHandlerTest.setup(RequestlogoutHandlerTest.java:39)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)        at org.junit.runners.model.FrameworkMethod.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.RunBefores.evaluate(RunBefores.java:24)        at org.robolectric.RobolectricTestRunner.evaluate(RobolectricTestRunner.java:251)        at org.robolectric.RobolectricTestRunner.runchild(RobolectricTestRunner.java:188)        at org.robolectric.RobolectricTestRunner.runchild(RobolectricTestRunner.java:54)        at org.junit.runners.ParentRunner.run(ParentRunner.java:290)        at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71)        at org.junit.runners.ParentRunner.runchildren(ParentRunner.java:288)        at org.junit.runners.ParentRunner.access0(ParentRunner.java:58)        at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268)        at org.robolectric.RobolectricTestRunner.evaluate(RobolectricTestRunner.java:152)        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)        at org.junit.runners.Suite.runchild(Suite.java:128)        at org.junit.runners.Suite.runchild(Suite.java:27)        at org.junit.runners.ParentRunner.run(ParentRunner.java:290)        at org.junit.runners.ParentRunner.schedule(ParentRunner.java:71)        at org.junit.runners.ParentRunner.runchildren(ParentRunner.java:288)        at org.junit.runners.ParentRunner.access0(ParentRunner.java:58)        at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:268)        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)        at org.junit.runner.JUnitCore.run(JUnitCore.java:137)        at com.intellij.junit4.JUnit4IDeaTestRunner.startRunnerWithArgs(JUnit4IDeaTestRunner.java:78)        at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:212)        at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68)        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:6

解决方法 我建议按照异常消息中的建议禁用Mockito的ClassCache
.
这是我如何通过在AndroID Studio中添加一个MockitoConfiguration类来禁用Mockito ClassCache.

>在您的单元测试目录src / test / java下,创建与Mockito配置包,org / mockito / configuration完全相同的包目录.
>所以在完整的测试目录下的src / test / java / org / mockito / configuration下,添加一个名为MockitoConfiguration的新类.
>覆盖enableClassCache()方法如下.

>当您在src / java / test下运行单元测试时,应加载MockitoConfiguration,并禁用Mockito类缓存.

希望它有帮助.

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