用PowerMock获取PowerMock，用Mockito实现JUnit中的PowerRule

Question

我已经将PowerMock和PowerRule集成到了JUnit和Mockito中。

下面是我的依赖关系：

<dependency>
        <groupId>javassist</groupId>
        <artifactId>javassist</artifactId>
        <version>3.12.0.GA</version>
      </dependency>
<dependency>
        <groupId>asm</groupId>
        <artifactId>asm</artifactId>
        <version>3.3.1</version>
</dependency>

 <dependency>
        <groupId>cglib</groupId>
        <artifactId>cglib</artifactId>
        <version>2.2.2</version>
 </dependency>
 <dependency>
        <groupId>org.powermoc</groupId>
    <artifactId>powermock-module-junit4</artifactId>
    <version>1.4.12</version>
    <scope>test</scope>
    </dependency>
 <dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-api-mockito</artifactId>
    <version>1.4.12</version>
    <scope>test</scope>
 </dependency>
 <dependency>
       <groupId>org.powermock</groupId>
       <artifactId>powermock-module-junit4-rule</artifactId>
       <version>1.4.12</version>
       <scope>test</scope>
 </dependency>
 <dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-classloading-objenesis</artifactId>
        <version>1.4.12</version>
        <scope>test</scope>
 </dependency>

我的考试课是：

public class TestClass extends AbstractShiroTest{
    @Rule
    public PowerMockRule rule = new PowerMockRule();
    @Autowired
    SomeService someService;
    @Before

    public void setUp(){
    Map<String, Object> newMap = new HashMap<String, Object>();
    newMap.put("userTimeZone", "Asia/Calcutta");
    Subject subjectUnderTest = mock(Subject.class);
             when(subjectUnderTest.getPrincipal()).thenReturn(LMPTestConstants.USER_NAME);
    Session session = mock(Session.class);
    when(session.getAttribute(LMPCoreConstants.USER_DETAILS_MAP)).thenReturn(newMap);
    when(subjectUnderTest.getSession(false)).thenReturn(session);
    setSubject(subjectUnderTest);
    PowerMockito.mockStatic(CasSessionUtil.class);
    when(CasSessionUtil.getCarrierId()).thenReturn(1L);
}

  @Test

public void myTestMethod()  {
someService.doSomething();
 }
}

doSomething 正在调用我需要模拟的静态方法。当我运行我的测试用例时，我得到了

全堆栈跟踪：

org.powermock.core.classloader.MockClassLoader.loadUnmockedClass(MockClassLoader.java:187)，org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:147)，org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:67)，java.lang.ClassLoader.loadClass(ClassLoader.java:252)，java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)，java.langorg.powermock.api.support.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:66)，org.powermock.api.support.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:26)，org.powermock.classloading.DeepCloner.cloneFields(DeepCloner.java:243)，org.powermock.classloading.DeepCloner.performClone(DeepCloner.java:128)，org.powermock.classloading，java.lang.Class.forName(Class.java:247)。org.powermock.classloading.DeepCloner.performClone(DeepCloner.java:128)，org.powermock.classloading.DeepCloner.cloneFields(DeepCloner.java:248)，org.powermock.classloading.DeepCloner.performClone(DeepCloner.java:128)，org.powermock.classloading.DeepCloner.cloneFields(DeepCloner.java:248)，org.powermock.classloading.DeepCloner.performClone(DeepCloner.java:128)，org.powermock.classloading。org.powermock.classloading.DeepCloner.performClone(DeepCloner.java:128)，org.powermock.classloading.DeepCloner.cloneFields(DeepCloner.java:248)，org.powermock.classloading.DeepCloner.performClone(DeepCloner.java:128)，org.powermock.classloading.DeepCloner.cloneFields(DeepCloner.java:248)，org.powermock.classloading.DeepCloner.performClone(DeepCloner.java:128)，org.powermock.classloading。org.powermock.classloading.DeepCloner.clone(DeepCloner.java:69) at org.powermock.classloading.ClassloaderExecutor.execute(ClassloaderExecutor.java:89) org.powermock.classloading.ClassloaderExecutor.execute(ClassloaderExecutor.java:78) at org.powermock.modules.junit4.rule.PowerMockStatement.evaluate(PowerMockRule.java:49) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72) DeepCloner.clone(DeepCloner.java:82)在org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) at org.junit.runners.ParentRunner.run(ParentRunner.java:236)在org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)的runTests(RemoteTestRunner.java:683)：javassist.NotFoundException：$Proxy88 at javassist.ClassPool.get(ClassPool.java:436) at org.powermock.core.classloader.MockClassLoader.loadUnmockedClass(MockClassLoader.java:180) . 46

如果我将依赖项更改为

<dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-classloading-xstream</artifactId>
            <version>1.4.12</version>
            <scope>test</scope>
        </dependency>

那我就得到了另一个例外。请看https://stackoverflow.com/questions/12176049/suggest-work-around-for-com-thoughtworks-xstream-converters-conversionexception (删除所以问题，要求10k)。

我甚至尝试过使用javassist版本15，但这也有同样的问题。

Answer 1

自己找出了解决办法：

只使用下面的依赖项(用于电源模拟和电源规则)

    <!-- Required for PowerMock -->
    <dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-api-mockito</artifactId>
        <version>1.4.12</version>
        <scope>test</scope>
    </dependency>
    <!-- Required for PowerMockRule -->
    <dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-module-junit4-rule-agent</artifactId>
        <version>1.4.12</version>
        <scope>test</scope>
    </dependency>

现在我没有得到上述任何一个例外。

Answer 2

将powermock模块-Junit4-规则替换为powermock模块-duit4-规则代理。

<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-module-junit4-rule-agent</artifactId>
    <scope>test</scope>
</dependency>

基于代理的引导程序与基于类加载的引导程序之间的主要区别是，您不会遇到类加载问题。

Answer 3

如果没有更多的代码示例，我就会发现代码在测试中使用Spring。因此，我认为造成此错误的原因是与Spring有关，Spring似乎确实生成了JDK代理( $Proxy88)。

Powermock的工作方式是在新的类加载器中运行JUnit测试，以便修改这些类的字节码，不幸的是，只能从真正的文件中修改字节码，或者至少可以从可以读取类二进制文件的位置修改字节码，因为java不能访问JVM中已经加载的字节码。(可能与代理人有一定的关系)。

由于JDK代理不存在于磁盘上，因此无法读取它们，也不能将它们复制到特定的Powermock类加载器中。

您正在编写的测试不是单元测试，因为它是与Spring上下文一起运行的。您可能需要首先编写一个真正的单元测试。然后是一些集成测试，，其中您不需要模拟。

此外，您应该避免使用静力学，因为这是一个可测试的噩梦。您应该以不需要对静态调用进行模拟的方式重写生产代码。

干杯,