我看到了一种非常奇怪的行为,试图截短类myMethod(param)的方法MyClass,该方法是在抽象父类MyAbstractBaseClass中定义的。
当我尝试存根(使用doReturn("...").when(MyClassMock).myMethod(...)等)时,这个方法失败了,在不同的场景下会抛出不同的异常。异常就在这一行抛出。
当我使用doReturn("...").when(MyClassMock).myMethod(CONCRETE PARAM CLASS OBJECT)时,出现以下异常:

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

hasValidExpirationDate()不是被存根的方法,但它是由抽象基类中MyMethod(param)的实际实现调用的。
当我使用doReturn("...").when(MyClassMock).myMethod(any(PARAMCLASS.class))时,出现以下异常:
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:

等等。
但是当我在子类中定义方法myMethod(param)时,代码不再失败。我在MyClass中的具体实现只是调用MyClass并返回它,因此除了修复单元测试之外,它没有任何效果。所以看起来mockito只能在被模仿的类中定义stub方法,而不能在超级类中。
我正在阅读mockito文档,我看不出它在哪里说继承的方法不能被存根。
super.myMethod(param)既不是myMethod(param)也不是static
代码:
类别:
import java.io.Serializable;

public class BaseCard implements Serializable {

    public boolean hasValidExpirationDate() {
        return true;
    }
}

类别:
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";
    }
}

类别:
public class DecryptedCard extends Card {

}

类别:
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)

最佳答案

根据this SO answer,当父类是非公共的时,模拟行为不能得到保证,如issue 212中所述。
(感谢brice在另一个线程中给出了正确的答案,并感谢vladimir、jb niset和acdcjunior在comments线程中共享调试进度!)

09-25 22:22
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