java - powerMockito 模拟文件对象

Question

我在使用 PowerMockito 模拟 whenNew(File.class) 时遇到问题。这是我要测试的方法:

public void foo() {
    File tmpFile = new File("Folder");
    if (!tmpFile.exists()) {
        if (!configFolder.mkdir()) {
            throw new RuntimeException("Can't create folder");
        }
    }
    File oneFileInFolder = new File(tmpFile, "fileOne.txt");
    if (oneFileInFolder.exists()){
        //do something
    } 
}

这是我写的测试代码:

static File mockFile;
@Before
public void setUp() throws Exception {
    //....some code 
    mockFolder = mock(File.class);
    when(mockFolder.getPath()).thenReturn("Folder");
    when(mockFolder.exists()).thenReturn(true);
    whenNew(File.class).withParameterTypes(String.class).withArguments(anyString()).thenReturn(mockFolder);
    //...some code
}

但是当我调试我的测试用例时，我仍然看到在我的 pwd 中创建了一个真实的文件夹。我不想在运行测试用例时创建文件夹。任何想法？

Answer 1

由于您没有在问题中指定这一点，因此可能缺少以下内容:

@PrepareForTest(ClassYoureCreatingTheFileInstanceIn.class)

根据Wiki :

Note that you must prepare the class creating the new instance of MyClass for test, not the MyClass itself. E.g. if the class doing new MyClass() is called X then you'd have to do @PrepareForTest(X.class) in order for whenNew to work.

换句话说，X 是您示例中包含 foo() 的类。