如何使用EasyMock模拟从抽象类继承的方法？
[英]How do I mock a method inherited from an abstract class with EasyMock?
问题描述
I'm struggling with EasyMock. 
我在与EasyMock斗争。 I've written two small classes to illustrate my problem: 我编写了两个小类来说明我的问题：
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 {
}
Then I proceed to write a test method as follows: 然后我继续编写如下的测试方法：
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();
}
}
The problem is that I want EasyMock to simply mock an instance of class B (my actual class isn't empty, but instead adds more methods to the methods inherited from the abstract class). 问题是我希望EasyMock简单地模拟类B的实例（我的实际类不是空的，而是向从抽象类继承的方法中添加了更多方法）。 Instead, EasyMock somehow actually goes into the code of class A and starts complaining about a NullPointerException. 相反，EasyMock实际上以某种方式进入了A类的代码，并开始抱怨NullPointerException。 How do I make EasyMock mock a class that extends an abstract class? 如何使EasyMock模拟扩展抽象类的类？
When I run this test I get the following Failure trace: 当我运行此测试时，我得到以下失败跟踪：
java.lang.NullPointerException at com.my.project.package.tests.A.getId(A.java:9) at com.my.project.package.tests.EasyMockTester.test(EasyMockTester.java:11) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71) at org.junit.runners.BlockJUnit4Class
Oh yeah, I'm using Eclipse 3.6.2, JUnit 4.8.2 and EasyMock 3.0. 哦，是的，我正在使用Eclipse 3.6.2，JUnit 4.8.2和EasyMock 3.0。
EDIT: Seems PowerMock can handle mocking final methods inherited from abstract classes! 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 http://code.google.com/p/powermock/wiki/MockFinal
1 个解决方案
解决方案1
6 已采纳 2011-06-20 14:54:38
I think it's not related to abstract classes and so on. 我认为它与抽象类无关。 It's caused by the fact that EasyMock can't mock final methods. 这是因为EasyMock无法模拟final方法。 From the EasyMock documentation : 从EasyMock文档中 ：
Final methods cannot be mocked.
So, you need to make your method non-final, or use some other approach to testing that doesn't require mocking it. 因此，您需要使方法成为非最终方法，或者使用不需要模拟它的其他方法进行测试。
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