java - Mockito - stub 抽象父类方法

Question

我看到试图 stub 方法的行为很奇怪 myMethod(param)类MyClass在抽象父类中定义的 MyAbstractBaseClass .

当我尝试 stub (使用 doReturn("...").when(MyClassMock).myMethod(...) 等)时，此方法失败，在不同情况下会抛出不同的异常。异常会在该行抛出。

当我使用 doReturn("...").when(MyClassMock).myMethod(CONCRETE PARAM CLASS OBJECT) 时，我得到以下异常:

org.mockito.exceptions.misusing.WrongTypeOfReturnValue: 
String cannot be returned by hasValidExpirationDate()
hasValidExpirationDate() should return boolean
    at ...

hasValidExpirationDate()不是被 stub 的方法，而是被 MyMethod(param) 的实际实现调用在抽象基类中。

当我使用 doReturn("...").when(MyClassMock).myMethod(any(PARAMCLASS.class)) 时，我得到以下异常:

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: 
Invalid use of argument matchers!
0 matchers expected, 1 recorded.
This exception may occur if matchers are combined with raw values:

等

但是当我定义方法时 myMethod(param)在子类中 MyClass代码不再失败。我的具体实现在MyClass只需调用 super.myMethod(param)并返回它，所以它除了修复单元测试外没有任何作用。所以看起来 Mockito 只能 stub 定义在被模拟的类中的方法，而不是在父类(super class)中。

我正在阅读 Mockito 文档，但我没有看到它在哪里说不能 stub 继承的方法。

myMethod(param)既不是 static也不final .

代码:

类 BaseCard :

import java.io.Serializable;

public class BaseCard implements Serializable {

    public boolean hasValidExpirationDate() {
        return true;
    }
}

类 Card :

abstract class Card  extends BaseCard {

    public Card () {    }

    public String getUnexpiredStringForNetwork(){

        //If the date is invalid return empty string, except for Discover.
        if( ! hasValidExpirationDate()){
           return "hi";
        }

        return "hello";
    }
}

类 DecryptedCard :

public class DecryptedCard extends Card {

}

类 MyTest :

import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.mock;

import org.junit.Test;


public class MyTest {

    @Test
    public void test() {
        DecryptedCard decryptedCardMock = mock(DecryptedCard.class);

        doReturn("ABC").when(decryptedCardMock).getUnexpiredStringForNetwork();

    }

}

失败:

org.mockito.exceptions.misusing.WrongTypeOfReturnValue: 
String cannot be returned by hasValidExpirationDate()
hasValidExpirationDate() should return boolean
***
If you're unsure why you're getting above error read on.
Due to the nature of the syntax above problem might occur because:
1. This exception *might* occur in wrongly written multi-threaded tests.
   Please refer to Mockito FAQ on limitations of concurrency testing.
2. A spy is stubbed using when(spy.foo()).then() syntax. It is safer to stub spies - 
   - with doReturn|Throw() family of methods. More in javadocs for Mockito.spy() method.

    at Card.getUnexpiredStringForNetwork(Card.java:10)
    at DecryptedCard.getUnexpiredStringForNetwork(DecryptedCard.java:1)
    at MyTest.test(MyTest.java:13)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    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)

Answer 1

根据 this SO answer ，当父类是非公共(public)的时，模拟行为无法保证，如 issue 212 中所述.

(感谢 Brice 在其他线程中的良好回答，并感谢 Vladimir、JB Nizet 和 acdcjunior 在评论线程中分享调试进度!)