具有 clone() 方法的类的 EasyMock 创建模拟失败答案

【问题标题】：EasyMock create mock fails for a class with a clone() method具有 clone() 方法的类的 EasyMock 创建模拟失败
【发布时间】：2020-02-07 04:43:57
【问题描述】：

我在尝试模拟具有 clone() 方法的类时遇到问题，该方法会创建对象的深层副本。当我删除此方法时，模拟工作正常。

public class ConcreteClass implements Iterable<Record> {

    @Override
    public Iterator<Record> iterator() { 
    }

    public ConcreteClass clone() {
        ConcreteClass copy = new ConcreteClass();
        return copy;
    }

使用EasyMock.createMock(ConcreteClass.class) 创建上述类的模拟失败并出现以下异常

java.lang.ArrayIndexOutOfBoundsException: 15092

    at net.sf.cglib.asm.ClassReader.<init>(Unknown Source)
    at net.sf.cglib.asm.ClassReader.<init>(Unknown Source)
    at net.sf.cglib.asm.ClassReader.<init>(Unknown Source)
    at net.sf.cglib.asm.ClassReader.<init>(Unknown Source)
    at net.sf.cglib.proxy.BridgeMethodResolver.resolveAll(BridgeMethodResolver.java:61)
    at net.sf.cglib.proxy.Enhancer.emitMethods(Enhancer.java:911)
    at net.sf.cglib.proxy.Enhancer.generateClass(Enhancer.java:498)
    at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
    at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
    at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
    at net.sf.cglib.proxy.Enhancer.createClass(Enhancer.java:317)
    at org.easymock.internal.ClassProxyFactory.createProxy(ClassProxyFactory.java:175)
    at org.easymock.internal.MocksControl.createMock(MocksControl.java:129)
    at org.easymock.internal.MocksControl.createMock(MocksControl.java:103)
    at org.easymock.internal.MocksControl.createMock(MocksControl.java:94)
    at org.easymock.EasyMock.createMock(EasyMock.java:136)
    at com.test.Test(Test.java:51)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.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.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)

但是，当我删除 clone() 方法时，我可以成功创建一个模拟。我正在使用 EasyMock 3.x

【问题讨论】：

标签： mocking easymock

【解决方案1】：

指定完整的 EasyMock 版本是个好主意。我刚刚尝试了 EasyMock 4.0.2，它没有任何问题。所以升级可能是答案。

请注意，clone() 是 Java 的一个特殊名称。用户通常会期望类是Cloneable 并且覆盖返回Object（出于许多遗留原因）而不是实际类。实现应该调用super.clone()。如果我是你，我会将方法重命名为copy()。

【讨论】：