在 JUnit 中删除文件和目录

我正在为在目录中创建文件的方法编写测试。我的 JUnit 测试如下所示：

  @Before
  public void setUp(){
      objectUnderTest = new ClassUnderTest();
      //assign another directory path for testing using powermock
      WhiteBox.setInternalState(objectUnderTest, "dirPathField", mockDirPathObject);

      nameOfFile = "name.txt";
      textToWrite = "some text";
  }

  @Test
  public void shouldCreateAFile(){


      //create file and write test
      objectUnderTest.createFile(nameOfFile, textToWrite);
      /* this method creates the file in mockPathObject and performs
         FileWriter.write(text);
         FileWriter.close();
      */

      File expect = new File(mockPathObject + "\\" + nameOfFile);
      assertTrue(expect.exist());

      //assert if text is in the file -> it will not be called if first assert fails
  }

  @After
  public void tearDown(){
       File destroyFile = new File(mockPathObject + "\\" + nameOfFile);
       File destroyDir = new File(mockPathObject);

       //here's my problem
       destroyFile.delete(); //why is this returning false?
       destroyDir.delete(); //will also return false since file was not deleted above

  }

我能够使用deleteOnExit()删除文件，但无法使用delete或deleteOnExit删除目录。我还将在此测试脚本中针对其他场景执行其他测试，因此我不想使用deleteOnExit。

我不知道为什么我无法在 JUnit 测试脚本中删除它，而当代码不是 JUnit 测试时，我可以删除运行时由 FileWriter 创建和修改的文件。我还尝试在测试方法之后执行无限循环并手动删除该文件，但它告诉我其他程序仍在使用该文件，尽管我可以修改其内容。

希望有人可以建议一种方法来删除测试期间创建的文件和目录。感谢：D

为了更清楚起见，我测试的方法如下所示调用 FileWriter 的单元测试方法 https://stackoverflow.com/questions/11878716/unit-testing-method-that-invokes-filewriter

编辑：这是测试方法

    public void createFile(String fileName, String text){

           //SOME_PATH is a static string which is a field of the class
           File dir = new File(SOME_PATH); //I modified SOME_PATH using whitebox for testing

           if(!dir.exists()){
                booelan createDir = dir.mkdirs();
                if(!createDir){
                           sysout("cannot make dir");
                           return;
                }
           }


           try{
                 FileWriter fileWrite = new FileWriter(dir.getAbsolutePath() + "/" + fileName, true);
                 fileWrite.write(text);
                 fileWrite.close();
           }
           catch(Exception e){
                 e.printStackTrace();
           }

    }

我无法修改此方法，因为其他开发人员创建了它。我刚刚被指示为测试自动化创建单元测试。谢谢。

使用@Rule注释和TemporaryFolder您需要删除的文件夹的类。

http://kentbeck.github.com/junit/javadoc/4.10/org/junit/Rule.html（404未找到）

更新使用示例http://junit.org/junit4/javadoc/4.12/org/junit/rules/TemporaryFolder.html http://junit.org/junit4/javadoc/4.12/org/junit/rules/TemporaryFolder.html:

public static class HasTempFolder {

  @Rule
  public TemporaryFolder folder= new TemporaryFolder();

  @Test
  public void testUsingTempFolder() throws IOException {
    File createdFile= folder.newFile("myfile.txt");
    File createdFolder= folder.newFolder("subfolder");
    // ...
  }

}