doAnswer用于静态方法 - PowerMock [英] doAnswer for static methods - PowerMock

问题描述

我正在使用的静态方法之一，它做了两件事。它返回一些数据，但它也修改传递给它的参数对象。然后在代码中使用此更新的参数对象。

One of static method I am using, it does two things. It returns some data, but it also modifies the argument object that is passed to it. This updated argument object is then used later in code.

我使用PowerMock来模拟返回行为。

I am using PowerMock to mock the return behavior.

为了定义第二部分 - 更新输入参数，我正在定义doAnswer方法，但它不起作用。我正在尝试测试的方法如下所示。

For defining the second part - updating the input argument, I am defining doAnswer method but it's not working. The method that I'm trying to test looks like this.

public void login() throws ConnectionException, AsyncApiException {
    ConnectorConfig partnerConfig = new ConnectorConfig();

    //This call sets the value in one member variable 'serviceEndPoint in ParterConfig which is accessed later in this method only.
    partnerConnection = Connector.newConnection(partnerConfig);

    //partnerConfig.getServiceEndpoint is called.

    PowerMockito.mockStatic(Connector.class);
    when(Connector.newConnection(Mockito.any(ConnectorConfig.class))).thenReturn(partnerConnection);

    PowerMockito.doAnswer(new Answer<Void>() {
        @Override
        public Void answer(InvocationOnMock invocation) {
            ConnectorConfig config = (ConnectorConfig) invocation.getArguments()[0];
            config.setServiceEndpoint("service end point");
            return null;
        }
    }).when(Connector.newConnection(Mockito.any(ConnectorConfig.class)));
}     

但是在上面抛出错误，说'在这里检测到未完成的存根'。
连接器是第三方类，因此我无法控制其行为。

but above throws error saying 'Unfinished stubbing detected here'. Connector is a third party class so I don't have control over its behavior.

任何建议，可能出现什么问题？

Any suggestions, what could be going wrong?

推荐答案

PowerMockito.doAnswer(new Answer<Void>() {
    /* ... */
}).when(Connector.newConnection(Mockito.any(ConnectorConfig.class)));

当出现问题时你的。在正常的Mockito中，使用任何 doAnswer / doReturn / etc调用，你必须拨打你正在打断的电话<在时调用的外部，如下所示：

Your when is the problem. In normal Mockito, using any doAnswer/doReturn/etc call, you have to place the call you're stubbing outside of the call to when, like so:

Mockito.doAnswer(new Answer<Void>() {
    /* ... */
}).when(yourMock).callVoidMethod();
//            ^^^^^^

PowerMockito还需要调用静态方法在下一个声明中，如下所示：

PowerMockito further requires that calls to static methods happen in the next statement, like so:

PowerMockito.doAnswer(new Answer<Void>() {
    /* ... */
}).when(Connector.class); Connector.newConnection(/*...*/);
//                    ^^^^^^

请注意我链接的文档实际上是不一致的 - 看起来文档在时提到零参数，而在可用的签名中需要类文字。如果你有一个时刻，那么标记为错误可能是一件好事。

Note that the documentation I linked is actually inconsistent--looks like the docs allude to a zero-arg when, whereas the class literal is required in the signatures available. That might be a good thing to flag as a bug, if you have a moment.

强制性PSA：通常一个好主意< a href =http://davesquared.net/2011/04/dont-mock-types-you-dont-own.html =noreferrer>避免嘲笑你不拥有的类型，虽然陪审团仍然在那个上。

Obligatory PSA: It's generally a good idea to avoid mocking types you don't own, though the jury's still out on that one.

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