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尝试使用PowerMock模拟静态系统类会产生VerifyError

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我试图模拟JOptionPane静态方法,并陷入Java.lang.VerifyError . 所有版本都是最新版本,因为我刚下载了PowerMock for Mockito及其所有依赖项 .

我不能使用前一个问题的答案,包装类和子类包装器 - 这是我们的应用程序 . 此时我在PowerMock上投入了相当多的时间,我不想重新开始 .

有没有办法解决这个错误?我在指令中尝试了“模拟静态方法”和“模拟系统类” . 我不能再往前走,因为我所做的就是@RunWith(PowerMockRunner.class)和@PrepareForTest(My.class) .

我发现我可以通过任何对扩展JPanel的类的引用来解决这个问题 . 这是创建问题的最小测试(我在Boffo和JPanel上使用PrepareForTest得到了相同的例外):

import javax.swing.JPanel;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.powermock.core.classloader.annotations.PrepareForTest;
import org.powermock.modules.junit4.PowerMockRunner;

@RunWith(PowerMockRunner.class)
//@PrepareForTest(JPanel.class)
@PrepareForTest(TestCase.Boffo.class)
public class TestCase {

    @SuppressWarnings("serial")
    public static class Boffo extends JPanel {}

    @Test
    public void test() throws Exception {
        new Boffo();
    }
}

以下是我尝试运行测试时遇到的异常:

java.lang.VerifyError: (class: javax/swing/plaf/metal/MetalLookAndFeel, method: getLayoutStyle signature: ()Ljavax/swing/LayoutStyle;) Wrong return type in function
    at javax.swing.UIManager.setLookAndFeel(Unknown Source)
    at javax.swing.UIManager.initializeDefaultLAF(Unknown Source)
    at javax.swing.UIManager.initialize(Unknown Source)
    at javax.swing.UIManager.maybeInitialize(Unknown Source)
    at javax.swing.UIManager.getUI(Unknown Source)
    at javax.swing.JPanel.updateUI(Unknown Source)
    at javax.swing.JPanel.<init>(Unknown Source)
    at javax.swing.JPanel.<init>(Unknown Source)
    at javax.swing.JPanel.<init>(Unknown Source)
    at com.package.TestCase$Boffo.<init>(TestCase.java:17)
    at com.package.TestCase.test(TestCase.java:21)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:66)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:312)
    at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:86)
    at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:94)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:296)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:284)
    at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:84)
    at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:49)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:209)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:148)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:122)
    at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:34)
    at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:44)
    at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
    at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:102)
    at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
    at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:42)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
    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.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)

2 回答

  • 14

    以下是我的同事今天发现的一个简洁的解决方法/解决方案:只需将注释 @PowerMockIgnore("javax.swing.*") 添加到测试类中,PowerMock就会将有问题的类的加载推迟到系统类加载器 .

    编辑:重新阅读问题,因为你试图模仿JOptionPane本身,我不确定这会有所帮助,但也许你可以使用排除模式 .

  • 3

    我不知道为什么它会抛出 VerifyError ,但你可以通过在实例化类之前预先设置一个假的LookAndFill来克服它 .

    public static class FakeLookAndFill extends BasicLookAndFeel {
        @Override
        public String getName() {
            return "FakeLookAndFill";
        }
    
        @Override
        public String getID() {
            return "FakeLookAndFill";
        }
    
        @Override
        public String getDescription() {
            return "FakeLookAndFill";
        }
    
        @Override
        public boolean isNativeLookAndFeel() {
            return false;
        }
    
        @Override
        public boolean isSupportedLookAndFeel() {
            //note it returns true
            return true;
        }
    }
    
    @Before
    public void setUp() throws Exception {
        UIManager.setLookAndFeel(new FakeLookAndFill());
    }
    

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