如何使用EasyMock模拟从抽象类继承的方法？

Question

我正在与EasyMock挣扎.我写了两个小班来说明我的问题:

public abstract class A {
    private AtomicReference<Integer> id = new AtomicReference<Integer>(null);
    public final int getId() {
        return id.get();
    }
    public final boolean setId(int id) {
        return this.id.compareAndSet(null, id);
    }
}

public class B extends A {
}

然后我继续写一个测试方法如下:

public class EasyMockTester extends EasyMockSupport {
    @Test
    public void test() {
        B b = EasyMock.createStrictMock(B.class);
        EasyMock.expect(b.getId()).andReturn(100);
        replayAll();
        int id = b.getId();
        System.out.println("The ID is: " + id);
        verifyAll();
    }
}

问题是我希望EasyMock简单地模拟一个B类实例(我的实际类不是空的,而是为从抽象类继承的方法添加更多方法).相反,EasyMock实际上会进入A类的代码并开始抱怨NullPointerException.如何让EasyMock模拟扩展抽象类的类？

当我运行此测试时,我得到以下故障跟踪:

在显示java.lang.NullPointerException com.my.project.package.tests.A.getId(A.java:9)在com.my.project.package.tests.EasyMockTester.test(EasyMockTester.java:11)​​在阳光下.在sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)的sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)的java.lang.reflect.Method.invoke上的reflect.NativeMethodAccessorImpl.invoke0(Native Method) Method.java:597)在org.junit.runners.model.FrameworkMethod $ 1.runReflectiveCall(FrameworkMethod.java:44)在org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)的组织.在org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner)的org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)中的junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41). java:79)org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)at org.junit.runners.BlockJUnit4Class Runner.runChild(BlockJUnit4ClassRunner.java:49)在org.junit.runners.ParentRunner $ 3.run(ParentRunner.java:193)在org.junit.runners.ParentRunner $ 1.schedule(ParentRunner.java:52)在org.junit .runners.ParentRunner.runChildren(ParentRunner.java:191)在org.junit.runners.ParentRunner.access $ 000(ParentRunner.java:42)在org.junit.runners.ParentRunner $ 2.evaluate(ParentRunner.java:184)在org.junit.runners.ParentRunner.run(ParentRunner.java:236)在org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)在org.eclipse.jdt.internal.junit. run.TestExecution.run(TestExecution.java:38)位于org.eclipse.jdt.internal.junit.runner.RemoteTestRunner的org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467). runTests(RemoteTestRunner.java:683)位于org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner. Java的:197)

哦,是的,我正在使用Eclipse 3.6.2,JUnit 4.8.2和EasyMock 3.0.

编辑:似乎PowerMock可以处理从抽象类继承的模拟最终方法!http://code.google.com/p/powermock/wiki/MockFinal

Answer 1

我认为它与抽象类等无关.这是因为EasyMock无法模拟final方法.从EasyMock文档:

不能嘲笑最终方法.如果被调用,它们的正常代码将被执行

因此,您需要使您的方法不是最终的,或者使用其他一些不需要模拟它的测试方法.