对于带参数的方法，Powermockito doNothing [英] Powermockito doNothing for method with arguments

问题描述

我用Java开发了一个应用程序，我正在尝试使用Powermockito创建单元测试（我应该补充说我是单元测试的新手）。

I've developed an application in Java and I'm trying to create unit tests using Powermockito (I should add that I'm new to unit testing).

我有一个名为Resource的类，它有一个名为readResources的静态方法：

I have a class called Resource which has a static method called readResources:

public static void readResources(ResourcesElement resourcesElement);

ResourcesElement也由我编码。
在测试中，我想创建自己的资源，所以我希望上面的方法什么都不做。
我尝试使用此代码：

ResourcesElement is also coded by me. In testing, I want to create my own Resource, so I want the above method to do nothing. I tried using this code:

    PowerMockito.spy(Resource.class);
    PowerMockito.doNothing().when(Resource.class, "readResources", Matchers.any(ResourcesElement.class));

单元测试抛出异常：

org.mockito.exceptions.misusing.UnfinishedStubbingException：
此处检测到未完成的存根：
- > at org.powermock.api.mockito.internal.PowerMockitoCore.doAnswer（PowerMockitoCore。 java：36）

org.mockito.exceptions.misusing.UnfinishedStubbingException: Unfinished stubbing detected here: -> at org.powermock.api.mockito.internal.PowerMockitoCore.doAnswer(PowerMockitoCore.java:36)

Powermockito还建议我应该使用thenReturn或者之后的Throw，但似乎方法'when'返回在doNothing之后调用它时是无效的（这是合乎逻辑的）。
如果我尝试：

Powermockito also suggest that I should use thenReturn or thenThrow after when, but it seems that the method 'when' returns void when it is called after doNothing (which is logical). If I try:

PowerMockito.when(Resource.class, "readResources", Matchers.any(ResourcesElement.class)).....

在什么时候不做任何选择。

doNothing is not an option after when.

我设法使用方法的2个参数版本创建没有参数的方法，什么都不做。例如：

I managed to make methods without arguments to do nothing, using the 2 arguments version of the method. For example:

PowerMockito.doNothing().when(Moduler.class, "startProcessing");

这有效（startProcessing不接受任何参数）。

This works (startProcessing doesn't take any arguments).

但是我怎样才能制作出能够使参数与Powermockito无关的方法？

But how can I make methods that do take arguments to do nothing with Powermockito?

推荐答案

你可以找到一个功能齐全的例子如下。由于您没有发布完整示例，我只能假设您没有使用 @RunWith 或 @PrepareForTest 因为剩下的就好了。

You can find a fully functional example below. Since you didn't post the complete example, I can only assume that you did not annotate the test class with @RunWith or @PrepareForTest because the rest seems fine.

@RunWith(PowerMockRunner.class)
@PrepareForTest({Resource.class})
public class MockingTest{

    @Test
    public void shouldMockVoidStaticMethod() throws Exception {
        PowerMockito.spy(Resource.class);
        PowerMockito.doNothing().when(Resource.class, "readResources", Mockito.any(String.class));

        //no exception heeeeere!
        Resource.readResources("whatever");

        PowerMockito.verifyStatic();
        Resource.readResources("whatever");
    }

}

class Resource {
    public static void readResources(String someArgument) {
        throw new UnsupportedOperationException("meh!");
    }
}

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