Mockito间谍 - 部分嘲笑不起作用？

我的场景非常简单.根据对此的最后答案和Mockito本身的文档,尝试使用部分嘲笑.我的测试是:

@Test
public void test() {
    ClassUnderTest realObject = new ClassUnderTest();
    ClassUnderTest spy = spy(realObject);
    when(spy.methodB()).thenThrow(new Exception("Testing"));

    spy.methodA();
}

被测试的课程是:

import org.apache.commons.lang3.NotImplementedException;

public class ClassUnderTest {

    int methodB(){
        throw new NotImplementedException("Not implemented");
    }

    public int methodA(){
        methodB();
        return 0;
    }

}

我希望我的间谍对象会调用方法B引发"测试"异常,而实际上这个方法被称为抛出"未实现"异常.它表现得像我没有部分模拟行为

这是为什么？我错过了什么？

编辑:正如RPresle建议的那样,我尝试使用语法

doThrow(new Exception("Testing")).when(spy.methodB());

但是,我得到一个UnfinishedStubbingException:

org.mockito.exceptions.misusing.UnfinishedStubbingException: 
Unfinished stubbing detected here:
 -> at SimpleTest.test(SimpleTest.java:15)

E.g. thenReturn() may be missing.
Examples of correct stubbing:
when(mock.isOk()).thenReturn(true);
when(mock.isOk()).thenThrow(exception);
doThrow(exception).when(mock).someVoidMethod();
Hints:
 1. missing thenReturn()
 2. you are trying to stub a final method, you naughty developer!
 3: you are stubbing the behaviour of another mock inside before 'thenReturn' instruction if completed

at SimpleTest.test(SimpleTest.java:15)
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:497)
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.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

谁能提供更多指导？

参考Mockito的本教程,您可以看到Mockito确实调用了原始方法.

这种语法只有一个警告.真正的rule.createFileTemplate()方法将被调用一次.这可能会产生很多副作用,甚至可能无法抛出异常(通常是NPE).要解决这个问题,你可以(应该？)使用这种替代Mockito语法:

doReturn(mockFileTemplate).when(rule).createFileTemplate();

为了避免这种情况,您应该使用Mockito的其他语法 doReturn().when()

doThrow(new Exception("Testing")).when(spy).methodB();

希望这有帮助.

编辑:

请注意,结构有点不同when().thenReturn().

doThrow(new Exception("Testing"))
    .when(spy)
    .methodB();