我正在使用easymock + powermock编写测试，我使用powermock的原因是模拟静态方法。
我的测试类如下所示：
import static org.powermock.api.easymock.PowerMock.mockStatic;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;
@RunWith(PowerMockRunner.class)
@PrepareForTest(StaticTest.class)
public class DummyTest {
@Test
public void testDummy() {
mockStatic(StaticTest.class);
Mockito.when(StaticTest.testMethod()).thenReturn("hello world");
........
}
这是我的测试依赖项和版本：
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-junit4</artifactId>
<version>1.4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-api-easymock</artifactId>
<version>1.4.12</version>
<scope>test</scope>
</dependency>
运行测试，我得到初始化错误如下：
java.lang.NoClassDefFoundError: net/sf/cglib/proxy/Enhancer
at org.powermock.api.extension.proxyframework.ProxyFrameworkImpl.isProxy(ProxyFrameworkImpl.java:29)
at org.powermock.reflect.internal.WhiteboxImpl.getUnmockedType(WhiteboxImpl.java:1783)
at org.powermock.reflect.internal.WhiteboxImpl.getType(WhiteboxImpl.java:2237)
at org.powermock.reflect.internal.WhiteboxImpl.setInternalState(WhiteboxImpl.java:327)
at org.powermock.reflect.proxyframework.RegisterProxyFramework.registerProxyFramework(RegisterProxyFramework.java:18)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.powermock.reflect.internal.WhiteboxImpl.performMethodInvocation(WhiteboxImpl.java:2014)
at org.powermock.reflect.internal.WhiteboxImpl.doInvokeMethod(WhiteboxImpl.java:885)
at org.powermock.reflect.internal.WhiteboxImpl.invokeMethod(WhiteboxImpl.java:859)
at org.powermock.reflect.Whitebox.invokeMethod(Whitebox.java:466)
at org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.registerProxyframework(AbstractTestSuiteChunkerImpl.java:154)
at org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.getPowerMockTestListenersLoadedByASpecificClassLoader(AbstractTestSuiteChunkerImpl.java:107)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:144)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.createDelegatorFromClassloader(JUnit4TestSuiteChunkerImpl.java:39)
at org.powermock.tests.utils.impl.AbstractTestSuiteChunkerImpl.createTestDelegators(AbstractTestSuiteChunkerImpl.java:217)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.<init>(JUnit4TestSuiteChunkerImpl.java:59)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.<init>(AbstractCommonPowerMockRunner.java:32)
at org.powermock.modules.junit4.PowerMockRunner.<init>(PowerMockRunner.java:31)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:31)
at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:24)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:29)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:33)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:48)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.ClassNotFoundException: net.sf.cglib.proxy.Enhancer
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.powermock.core.classloader.MockClassLoader.loadModifiedClass(MockClassLoader.java:143)
at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:67)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 39 more
以前有人遇到过这个问题吗？
你的类路径中需要 cglib。
在 maven 中添加 cglib 依赖项解决了 powermock 1.5.5 的初始化错误问题，如@Premraj所述。对于 1.4.12 Powermock 可能 cglib 的 2.2.2 版本应该这样做。
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>3.1</version>
<scope>test</scope>
</dependency>
对我来说
，添加cglib依赖项不起作用。我使用以下命令解决了这个问题：
<!--
We depend on the EasyMock API but exclude the EasyMock dependency. The reason
is that PowerMock Whitebox needs a "org.powermock.reflect.spi.ProxyFramework"
implementation in order to work correctly. This implementation is provided by
the extension API:s. Since JMock uses CGLib it can reuse the
"org.powermock.api.extension.proxyframework.ProxyFrameworkImpl" in the
PowerMock EasyMock API. An alternative to depend on this class would be to simply copy
the class it into your code (remember that the class must be named
org.powermock.api.extension.proxyframework.ProxyFrameworkImpl).
-->
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-api-easymock</artifactId>
<version>${project.version}</version>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.easymock</groupId>
<artifactId>easymock</artifactId>
</exclusion>
</exclusions>
</dependency>
如此处所述。注意我没有使用易莫克（我改用 mockito）
我尝试了多个选项，最后下面的依赖项对我有用。应该使用更高版本的PowerMock和Mockito在spring启动应用程序中工作。
下面是 maven 依赖项：
spring-boot： 2.0.1.RELEASE（默认包含Junit： 4.12版本）
' 1.8 2.0.0-贝塔.5
</properties>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-api-mockito2</artifactId>
<version>${powermock-version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-junit4</artifactId>
<version>${powermock-version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-core</artifactId>
<version>${powermock-version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-junit4-rule</artifactId>
<version>${powermock-version}</version>
<scope>test</scope>
</dependency>'
添加以下依赖项后，我解决了同样的问题。
testCompile('org.powermock:powermock-api-mockito2:2.0.0-beta.5')
testCompile('org.powermock:powermock-module-junit4:2.0.0-beta.5')