如何在Java中模拟静态方法？ [英] How to mock static method in Java?

问题描述

我有一个类 FileGenerator ，我正在为 generateFile（）方法编写测试执行以下操作：

I have a class FileGenerator, and I'm writing a test for the generateFile() method that should do the following:

1）它应该在 getBlockImpl（FileTypeEnum） > BlockAbstractFactory

1) it should call the static method getBlockImpl(FileTypeEnum) on BlockAbstractFactory

2）它应该从子类方法<$填充变量 blockList c $ c> getBlocks（）

2) it should populate variable blockList from the subclass method getBlocks()

3）它应该调用静态方法 createFile 从最终助手类 FileHelper 传递一个String参数

3) it should call a static method createFile from a final helper class FileHelper passing a String parameter

4）它应该调用每个<的运行方法在blockList中code> BlockController

4) it should call the run method of each BlockController in the blockList

到目前为止，我有这个空方法：

So far, I have this empty method:

public class FileGenerator {
    // private fields with Getters and Setters

    public void generateBlocks() {
    }
}

我使用JUnit，Mockito模拟对象，我尝试使用PowerMockito来模拟的tatic和final类（Mockito没有这样做）。

I am using JUnit, Mockito to mock objects and I've tried using PowerMockito to mock static and final classes (which Mockito doesn't do).

我的问题是：我的第一个测试（调用方法 getBlockList（）来自 BlockAbstractFactory ）正在传递，即使 generateBlocks（）中没有实现。我已经在 BlockAbstractFactory 中实现了静态方法（到目前为止返回null），以避免Eclipse语法错误。

My problem is: my first test (calling method getBlockList() from BlockAbstractFactory) is passing, even though there is no implementation in generateBlocks(). I have implemented the static method in BlockAbstractFactory (returning null, so far), to avoid Eclipse syntax errors.

如何测试静态方法是否在 fileGerator.generateBlocks（）中调用？

How can I test if the static method is called within fileGerator.generateBlocks()?

这是我的测试类，到目前为止：

Here's my Test Class, so far:

@RunWith(PowerMockRunner.class)
public class testFileGenerator {
    FileGenerator fileGenerator = new FileGenerator();

    @Test
    public void shouldCallGetBlockList() {
            fileGenerator.setFileType(FileTypeEnum.SPED_FISCAL);

            fileGenerator.generateBlocks();

            PowerMockito.mockStatic(BlockAbstractFactory.class);
            PowerMockito.verifyStatic();
            BlockAbstractFactory.getBlockImpl(fileGenerator.getFileType());
    }
}

推荐答案

我没有PowerMock的经验，但由于你还没有得到答案，我只是在阅读文档，看看我是否可以帮助你。

I have no experience with PowerMock, but since you didn't get an answer yet I'm just been reading through the documentation to see if I can help you a bit on your way.

我发现你需要准备PowerMock，以便我知道它需要准备哪些静态方法来进行模拟。像这样：

I found that you need to prepare PowerMock so that I knows which static methods it needs to prepare to be mocked. Like so:

@RunWith(PowerMockRunner.class)
@PrepareForTest(BlockAbstractFactory.class) // <<=== Like that
public class testFileGenerator {
    // rest of you class
}

此处您可以找到更多信息。

Here you can find more information.

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